Практика Shadowing: Exposing The Flaw In Our Phone System - Изучайте разговорный английский по видео

This is Linus from Linus Tech Tips and we hacked the phone network in order to spy on him.

That's pretty messed up, Derek.

I slept easier not knowing that.

We intercepted his phone calls and stole his two-factor passcodes.

Is that your number, Linus?

Yeah, but I didn't get.. mine didn't even ring.

We didn't touch his phone, we didn't send him an email or a text, nothing.

We did it all remotely.

And the worst part is, it could happen to you.

I think I'm really surprised that, no offense, but like, you guys did it.

You know?

Well, you're not a career criminal hacker mastermind, necessarily.

No, indeed.

But here it is, a normal looking and feeling device with no,

you know, obvious problem with it, and you just.. receive my call instead of me receiving it.

Just what, like on command?

You just, it's an app on your computer or what?

I don't even know.

But before we explain how we did all that...

The first startup that Steve Jobs and Steve Wozniak made wasn't Apple.

No, they were tackling a different problem, one where their product was actually illegal.

So back in the 1970s, long-distance phone calls were really expensive.

Adjusted for inflation, a call from New York to London could run you $25 a minute.

So these two entrepreneurs created a little blue box.

And what it did was it hacked the telephone network.

They could trick the telephone company into connecting the calls for free, among other things.

We were young, and what we learned was

that we could build something ourselves that could control billions of dollars worth of infrastructure in the world.

I don't think there would have ever been an Apple computer had there not been blue box.

Wasse said you called the Pope.

Yeah, we did call the Pope.

Wasse pretended to be Henry Kissinger.

And we got the number of the Vatican and we called the Pope.

They started waking people up in the hierarchy, you know, I don't know, cardinals and this and that.

And they actually sent someone to wake up the Pope

when finally we just burst out laughing and they realized that we weren't Henry Kissinger.

But how were they able to do all of this with one electronic box made from Radio Shack parts?

Until the mid-1920s, most phones had no way of dialing.

When your phone was on the hook, about 48 volts was connected from the exchange to your phone.

Then when you lifted the receiver, an internal circuit connected the speaker and microphone, drawing power, and that caused the voltage to drop to around 10 volts.

And at the telephone exchange, this drop turned on a light bulb, alerting the operator who would then pick up and ask who you're calling.

Boston?

Sir?

Get me the Bluebird Diner.

And after consulting a directory, they would connect a wire between your line and your friends.

Manually connecting calls was labor-intensive.

Operators had to handle hundreds of connections per hour.

In 1910, one pundit said, the telephone system will need to employ every working-age woman in the country as an operator.

By 1950, there were more than a million of them in the US alone.

To reduce costs, companies sought to automate the call connection process, and one solution was the rotary dial telephone.

To use it, you place your finger in a number hole, rotate it to the end, and the dial rotates back.

And on the inside, a metal disc with ridges turns.

Each ridge pushes two metal plates into contact, completing the circuit to the exchange.

The dial sends pulses to match each number.

For the number two, it sends two pulses.

For the number three, it sends three pulses.

This goes on up to ten pulses for the number zero, which is why zero is at the far end of the dial instead of beside the one.

Those pulses that travel down the phone line, they determine how your line is connected.

So they're known as control signals.

But as the length of the transmission line was increased, so did its capacitance and resistance.

And this caused the clear input signals to become distorted, smoothing out voltage changes.

So now the pulses couldn't trigger the switching at the exchange.

While this wasn't a problem for local calls, it made automating long distance almost impossible.

Now, all phone lines, including long-distance ones, were built to carry sounds in the human voice and hearing range, mainly from 300 to 3,400 hertz.

So why not use this built-in capability to carry control signals?

To do this, phone companies introduced the touchtone or push-button telephone.

On a keypad, specific frequencies were assigned to the horizontal axis and the vertical axis,

so that each button was uniquely identifiable by the combination of two tones.

By sending control signals within the voice band, all telephone networks could receive it using their existing systems, independent of distance.

But with this innovation came an opportunity for Jobs and Wozniak to exploit.

When you made a long-distance call, it was first routed to a central node.

This node communicated with a remote node, and they determined if a line was free by checking whether both sides were sending a 2600 Hz tone.

So Jobs and Woz exploited this.

First, they would dial a toll-free 1-800 number, which would get them into a local node.

and then they would send a 2600 Hertz tone into the phone.

This would trick the remote node into thinking the call had been disconnected.

So the remote node would start playing the 2600 Hertz tone again, but Jobs and Woz were still on the line and when they stopped playing the tone on their side,

the remote node assumed a new call was being placed.

By sending a key pulse tone, followed by the desired phone number and ending with a start tone,

they could connect to any long-distance number for free, as the home node still believed it was connected to a toll-free number.

The vulnerabilities in the signaling system were obvious.

To mimic the 2600 Hertz tone, some people would even use a toy whistle from a Cap'n Crunch cereal box.

It just happened to make that frequency.

The telephone companies clearly needed to develop a new signaling protocol, and their solution was to use a separate digital line for carrying control signals.

That way no one could control the network by sending tones down the voice line, because it no longer controlled how the call was connected.

This new protocol was called Signaling System Number 7, or SS7 for short, and it's still broadly in use today.

But it may not be as secure as people thought.

Princess Latifa of Dubai claimed that her father, Sheikh Mohammed, the ruling emir had held her in solitary confinement in the dark, beaten and sedated for several years.

In late February 2018, her Finnish martial arts instructor Tina helped her escape.

They fled to a yacht captained by former French intelligence officer Hervé Jaubert.

For eight days, they sailed toward India.

Latifa was hopeful, but it wasn't to last.

Late on the night of March 4th, a dark boat pulled up alongside.

It was sent by her father.

Laser sights pierced the smoke as agents boarded the yacht, abducting Latifa and taking her back to Dubai.

But how did they find her?

Well, the captain had been the victim of a coordinated SS7 attack, one aiming to pinpoint his location and,

by extension, the whereabouts of the princess.

And I'm going to show you how, using the exact same steps to spy on my friends.

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With their permission, of course.

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This is Karsten Nohl and Alexandre de Oliveira.

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They are cybersecurity specialists who are helping me spy on Linus.

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We took three steps to spy on him.

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First, you have to infiltrate SS7.

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Second, gain trust.

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And third, attack.

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Of course, the main reason any of this is possible is step one.

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When SS7 was introduced in 1980, mobile phones barely existed.

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They were so big that they were mainly just used as car phones.

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But things changed quickly and the number of mobile phones in the world exploded.

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Roaming is one of the main use cases of SR7.

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Say Derek, you visit me over here.

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Your phone would try to connect to a network that's foreign

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and that network would then have to reach out to your home network in Australia asking, is this a valid customer?

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Are you willing to pay for the charges that they'll incur on my network?

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And all of that information is exchanged over SS7.

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For this to work, telcos need to communicate with each other.

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So the way they do that is by making sure they're part of the same club.

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The way they share membership to to this club is by using unique addresses to identify where requests are coming from.

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SS7 is a global network, just like the internet.

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And like on the internet, you need some addressing scheme.

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So you need some way of saying this is me and this is you.

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And on the internet we use IP addresses, on SS7 we use what's called global titles, GTs.

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So to provide global roaming coverage, telcos typically establish agreements with two providers in each country they serve, one primary and one backup.

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Telcos generally accept messages only from global titles with which they have agreements.

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The whole system is designed to be a closed network with few barriers once inside.

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This is known as the walled garden approach.

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So this system seems pretty secure, and it was.

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When SS7 was developed in the 80s, the telecommunications landscape was dominated by a few large, reputable operators.

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These operators had established relationships and mutual interest in maintaining the integrity of the network.

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But 45 years on, the landscape has shifted dramatically.

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Now there are over 1200 operators and 4,500 networks, many of which need SS7 access,

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from virtual network operators to mass tech services sending Uber Eats notifications.

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There are so many more players in the garden that not all of them are trustworthy.

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Those companies, some of them sell services onto third parties, some of them can be bribed, some of them can be hacked.

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So there's probably thousands of ways into SS7 at reasonable effort or cost.

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How much are we talking?

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Like, how much would it cost to buy access to SS7?

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Buying a single SS7 connection isn't that expensive.

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We're talking a few thousand dollars per month.

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The people who do sell access, I mean, why would they do it?

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People sell SS7 access for one reason, money.

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And thanks to global agreements between providers, accessing a trusted GT is like gaining access to all the GTs they have partnerships with.

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We even saw the invoice of a valuable US-based GT being leased illegally for $13,000 a month.

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Are you buying access to SS7?

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I'm paying for access to SS7, yes.

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And we do that because we do SS7 security tests,

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so we need to be in a similar position as real hackers to get near real results.

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So step one, infiltrate SS7 is complete.

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On to step two, gain trust.

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Hackers today can try many different things once they've scaled the wall into the garden.

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But you need more than just SS7 access and a phone number to attack.

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Even a trusted GT and the phone number of the target isn't enough to uniquely identify them.

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No, you need something from the SIM card.

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The real key in a mobile network is a unique 15-digit identifier which belongs exclusively to the SIM card on the phone.

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It's called an International Mobile Subscriber Identity, or IMSI for short, and it is very important.

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Basically, to be able to collect the IMSI from a subscriber,

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we would launch some of the messages such as send routing info or send routing info for SN.

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These messages are normally used to collect the IMSI.

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Networks have firewalls in place that will deny some requests if they look suspicious.

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Getting an IMSI is crucial to appear trusted.

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So let's move on to the critical step three, attack.

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Do you want to just like try the phone?

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Is there anything you can try to see if it works?

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Like call someone or text someone?

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Sure, I'll call my wife.

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Does she normally pick up?

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Yeah, she'll probably pick up.

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Hello?

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Hello, Yvonne.

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This is the voice of your husband.

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I would like to talk to you about the payment.

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Um, okay, hi.

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No, no, it's me, it's me!

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Did she hang up on you?

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Yeah, yeah, she did.

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So we've established the phone works as a completely normal phone.

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Do you have any important calls coming up?

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I don't know if I'd say it's important, but I'm on my way to Creator Summit tonight, and James from Hacksmith was gonna call me, and we're gonna kind of make some plans.

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Uh, I'm getting a call right now.

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Are you getting a call?

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No. Hello, this is Linus.

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Hey Linus, it's James.

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How's it going?

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It's going really well.

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How are you?

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Pretty good.

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Am I going to see you at the YouTube Summit?

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Yes, I'm really looking forward to that.

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And man, do I hate Macs.

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I feel like that's your persona, man.

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You can't game on a Mac.

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Uh, Linus, you want to talk?

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I would like to talk, but I never got the call, so...

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What number did you dial?

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4473 Is that your number, Linus?

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Yeah, but I didn't get- mine didn't even ring.

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I heard it ring, but I heard it through my speakers on my computer, because I assume it went to your phone then.

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That's right.

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Or did it go to your computer?

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No, yeah, it went to everything of mine.

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So, yeah, James, I don't know.

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You called Linus and it went to me.

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Thank you for taking part in this weird demonstration.

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There is absolutely nothing here to indicate that I was supposed to receive a call.

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Yeah.

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And I mean, the crazy thing is that's like a regular Canadian SIM card in there.

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So, any Canadian SIM card, in theory, could be vulnerable to such an attack, where, you know, someone dials your number and it just doesn't go to you.

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This is like, freaking, but on a completely different level.

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That's exactly it!

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Now, I'm familiar already with the concept of SIM swapping, where you social engineer a way to get a SIM

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that is registered to someone else's account actually had accounts stolen that way in the past.

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But in this case, my phone still works.

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Hey, so the demo we're doing is pretty trippy hun.

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Basically, they had Hacksmith call me, my phone didn't ring at all,

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and instead Derek from Veritasium picked up the phone call and was able to talk to him, and Hacksmith had no idea that he called me and then...

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Sorry, I'm with Cindy.

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Oh, oh, hi Cindy.

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Oh, you're not a speaker.

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Okay, that's fine, just tell Cindy hi for me.

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Okay, bye.

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So how are we able to seize control of Linus' number like that?

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When you put a phone number in your address book, you often don't put the country code.

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But then if you're in a roaming scenario, that phone number would connect to a completely different person in the country you are currently in.

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So it does make sense to basically overrule people's choices as to whom they're trying to dial

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because they're not going to triple check each time whether their address book entries have country codes in them.

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This is a powerful function.

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By tricking the network into thinking his phone is roaming, we can rewrite the number he is calling to a number that we control.

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And so what I did at the end was when I received this message,

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I sent back your number that you can see here was your US-based number.

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So even if you were located in Australia, I was still able to forward the call to you on your US number in Australia.

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That's amazing, you just try a few times and then it works, right?

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Yes.

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It's not always that simple.

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But this time it was quite difficult.

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So the most important question I have now then is, what did you need to steal from me in order to become me?

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Like, is this something you can social engineer out of my carrier?

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Is this something that I would need to accidentally leak a screenshot of my IMEI?

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At the very simplest, all we would need is your phone number.

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That's it.

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You could even do something where I could act as a middleman where I would reroute the call to me,

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but also simultaneously, I would dial for you the real number and I would send you through to them.

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And then I can sit on the line and just record that call.

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Yikes.

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But this isn't the only attack.

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We can do a lot more with SS7.

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We can also intercept text messages as part of our suite of attacks.

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Similar to phone calls, we can trick the network into thinking the target is roaming, which reroutes their messages to our GT.

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We can then steal one-time passwords used in two-factor authentication.

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This type of attack works until the subscriber interacts with their phone network, at which point the phone reconnects to the correct GT.

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But you need a few seconds only to hack into somebody's account, of course.

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You need that few-second window to receive the one-time password.

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So we actually set up a new Linus YouTube channel.

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Okay, so theoretically, he could get this username and password via a dump

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because I'm a butthead and I use the same username and password across different accounts.

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Or he could install a keylogger on my system he could get it that way when I'm typing it in.

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So then I verify my number, but of course he has my number because that's realistically not that hard to find.

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And theoretically, I'm supposed to get a two factor code right now, except...

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I got it.

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820299. I'm in.

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He's in, he hacked the mainframe.

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Wild, hey?

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Yep, we can hack your YouTube account.

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I'm going to start posting science videos on Linus Tech Tips.

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Oh, that's okay.

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I'm sure they'll get like 30 million views or whatever, so I'll be fine with it.

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Thanks for the AdSense.

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Deal.

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And you could see the code right there.

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Exactly.

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So you could see it at the bottom, 820299.

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So basically, once the interception is running, then I would receive any SMS sent.

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He would never have known that he missed those messages or that they were intercepted.

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Exact.

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Wow.

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Yeah, this seems pretty serious.

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I mean, SMS two-factor authentication is almost the default, right?

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Unfortunately, yes.

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It's not only the default, but in some cases it is the only available option.

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And sometimes that can even be for accounts that should be treated with the utmost of care, like a bank account.

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There's a third method of attack that we weren't able to show Linus.

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Lucky for him, his network blocked the requests.

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On many networks, you can use the IMSI number

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and the switching center info we harvested in step 2 to send a command deeper into the network.

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By targeting the switching center where the device with the IMSI is connected, we can issue a command routinely used for legitimate purposes, such as routing and forwarding calls,

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or providing emergency services based on the device's location.

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Using this request, we can track a target's location.

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It's not as hard as you'd think.

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SS7 doesn't even rely on GPS to locate someone.

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In fact, it was invented before GPS was even in public use.

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One way to do this is if a target is in range of multiple cell towers, their location can be narrowed down to where the signals overlap.

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The more towers in range, the more precise the location.

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A more accurate method measures the time it takes for signals to reach a phone from three towers.

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By calculating the distance based on transmission speed, we can pinpoint an exact location on a 2D plane.

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But SS7 attacks don't use either of these methods.

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They try to be subtle.

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An SS7 location request simply identifies the cell tower the target is connected to.

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In an urban area with many towers, this can place them to within 100 meters.

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You will definitely know which city block somebody is in.

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And if you wanted to, for instance, find out whether they're at home or at work, this is a great way to do it.

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Yeah, that's a little bit scary.

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In 2016, Karsten and his team used this method to track US Congressman Ted Lieu.

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The Congressman has been in California, more specifically the LA area.

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Let's zoom in here a little bit.

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So that is how we did it.

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We executed three steps.

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We infiltrated SS7, gained trust and attacked.

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We intercepted Linus' phone calls and text messages.

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I'm not sure he was as excited about it as I was.

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This is why we can't have nice things.

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Up until now, this has just been a bit of fun.

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I've demonstrated these attacks on a friend of mine.

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But the threats are real, and they can have devastating consequences.

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They will kill her, the captain texted shortly before Latifa was abducted.

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His phone was the target of an SS7 attack that involved all three of the steps we explored.

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To start, the attackers had leased multiple GTs in different countries.

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Then the following all happened in a five minute window.

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First they sent at least seven separate requests aiming to get the captain's IMSI from his US based operator.

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When that didn't seem to work, they followed up with at least four location requests.

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So did it work?

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Well, all of these requests were blocked by firewalls.

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That's why we have all the details.

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But there was a sixth GT we haven't shown, this one nearby in the US.

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We have no information about the requests on this GT because they likely weren't stopped.

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We spoke with Crofton Black, the investigative journalist who revealed the SS7 exploits in this story, and this is what he told us.

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It's a brilliant example of SS7 involvement because it illustrates a classic, sophisticated pattern of attack.

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Multiple GTs in multiple countries, it's a textbook example of telco penetration risks.

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Though because the Emiratis were also using other software like Pegasus and other hardware like spotter planes,

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we can't say that any single one of these was the thing that led to her being found.

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But the evidence is damning, and SS7 is used pretty widely.

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Criminals have used SS7 to intercept SMS two-factor authentication codes and empty millions of dollars from bank accounts.

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For some, SS7 is just the first step.

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The NSO Group, a notorious Israeli cyber surveillance firm, acquired an SS7 tracking company in 2014.

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NSO is the company behind Pegasus, a spyware tool that gains complete access to targeted phones without a user clicking anything,

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embedding itself and erasing traces of entry.

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Such zero-click hacks are costly.

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They can cost more than $4 million per exploit.

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Before NSO commits resources targeting specific software or vulnerabilities on a phone, first they gather basic data, like device type and software version,

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to make their lives easier.

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And as you've seen with SS7, this isn't hard.

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One expert we spoke to tested a foreign network and found 20 to 30 VIPs were constantly under surveillance there,

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including the country's chief of cybersecurity.

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Accurate data on tracking is difficult to come by, but another expert provided evidence of more than two and a half million tracking attempts per year,

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though they reminded us that the people being targeted are generally those of interest to state agencies.

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Now, we couldn't find data on interception attempts, but luckily experts told us this is far less common.

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So millions of malicious SS7 requests are sent each year, but it used to be even worse.

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To request location over SS7, you used to be able to send a command without even knowing the IMSI, and the network would just provide it to you, no questions asked.

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The classical example is the anytime interrogation request, which as the name already suggests is kind of a creepy command.

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I don't believe there is ever legitimate purpose for one network to send this command to another network interrogating about their customers.

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Karsten Noll and fellow security researcher Tobias Engel exposed these vulnerabilities publicly in 2014.

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The SS7 research that was disclosed in 2014 was a wake-up call to the industry.

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Most people had heard rumors that SS7 tracking and spying was possible, but they hadn't really seen hard evidence of it, and especially how easy it is.

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That a ragtag gang of hackers from Berlin with very amateur means can do any type of SS7 hacking that they want.

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After their conference, all of the German telcos immediately started refusing these requests.

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Anytime integration is the first SS7 command everyone stopped because it was abused a lot and never used constructively,

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but there is over 150 other messages that need to be stopped as well to make SS7 be completely secure.

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So if there are so many ways to abuse SS7, why haven't we gotten rid of it?

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Well, because it's the backbone of 2G and 3G communications.

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So what if we phase out 2G and 3G?

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that has caused problems.

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Since 2018, cars in the EU are equipped with mandatory emergency call buttons that trigger in an accident.

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They need a SIM card to work.

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And to cut costs, guess what auto manufacturers are using?

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That's right, 2G and 3G SIM cards using SS7.

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You have to have that legacy support or when 4G connectivity drops, you have absolutely nothing left.

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Dude, the number of times that I'm on 3G, not insignificant.

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And I'm in a metropolitan area.

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What's surprising of course is

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that there hasn't been a global push yet to replace SS7 with one of the two newer versions of the technology,

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the latest of which that was introduced with 5G, seems pretty secure, but that's now a problem of first mover disadvantage.

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So because of the the network effects, you get nothing out of adopting a technology as the first guy.

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You want to be the last one when everyone else is already connected

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and you get the full benefit from also joining the club.

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So even though the 5G signaling protocol can stop the attacks completely, and many networks are using 5G technology on their networks, when routing calls between networks,

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SS7 is still the de facto standard.

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You create a tremendous amount of inertia, to use a term that's probably more your channel than my channel, that makes moving on extremely difficult.

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So unless there's some new major events that put this back on the public radar, it could be another 10,

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15, maybe even 20 years until SSF networks are finally switched off.

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What's crazy is that we exploited these vulnerabilities and I'm just a YouTuber.

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I did have the help of some excellent security researchers, but I'm surprised at how easy it all is.

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Now imagine if I had the backing of a government.

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This is a real problem.

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So what can you do to protect yourself?

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On the personal side, as long as you have a SIM card, unfortunately there's not much you can do about location tracking.

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If possible, choose alternatives to SMS-based two-factor authentication, so messages can't be intercepted.

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Use an authenticator app or hardware tokens.

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And if you're worried about phone tapping, use encrypted, internet-based calling services like Signal or WhatsApp.

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We've been told this is mainly used on people of interest.

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So should it really matter to you?

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SS7 is a huge privacy intrusion and there's millions of abuse cases every single month.

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Whether privacy intrusion is a problem for everyone individually, of course, is almost a philosophical question, right?

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Somebody who grew up more in the Berlin tradition of the Chaos Computer Club, like myself, strongly believes that privacy

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and the ability to kind of form your own thoughts without being observed is a prerequisite for democracy.

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But many other people would argue, nothing to hide, nothing to fear.

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Our technological world will never be perfect.

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By the time we secure or replace SS7, vulnerabilities will already have been found in the new system.

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But luckily, there's an easy way to be ready for whatever the future holds.

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Build your knowledge and problem solving skills a little bit every day.

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And you can start doing that right now for free with this video's sponsor, Brilliant.

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Brilliant's new course on data clustering, for example, equips you with the same tools security researchers like Karsten used to spot trends among the billions of SS7 messages.

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Что вы узнаете

Этот видеоролик поможет вам улучшить два ключевых навыка разговорного английского: разбор быстрого спонтанного диалога (например, между участниками обсуждения хакерских методов) и понимание технической лексики в контексте повседневной речи (термины like "control signals", "capacitance"). Также вы научитесь выделять важные детали в сложных объяснениях, что важно для эффективного общения на профессиональные темы.

Слушайте за этими звуками

В диалоге часто встречается связная речь и редукции, типичные для разговорного английского. Например: "didn't get mine didn't even ring" — здесь "didn't" сокращается до "didn't" (слабое произношение "did not"), а "even" сливается с "ring" в "evenring". Еще один пример: "they were tackling a different problem" — "were" произносится как "wer" (без звука "е" в конце). Обратите внимание на звуки линковки в фразах типа "long distance phone calls" — "long" и "distance" соединяются через мягкий переход "ng-d", а "distance" и "phone" сливаются в "distancephone".

Говорите как носитель

Чтобы подражать ритму и ударениям говорящих, обратите внимание на логическое ударение в предложениях. Например, в фразе "We hacked the phone network in order to spy on him" основное ударение падает на "hacked", "phone network" и "spy", что подчеркивает важность действия. В технических объяснениях, как "the dial sends pulses to match each number", ударение на "sends", "pulses" и "match" помогает выделить ключевые понятия. Для тренировки используйте метод shadow speak: повторяйте фразы сразу после говорящего, копируя его темп и интонацию. Это поможет вам привыкнуть к естественной речи и улучшить произношение. Ресурсы like shadowspeaks или shadow speech сайты могут помочь в регулярной практике, а учить английский по видео — один из самых эффективных способов освоить эти навыки.

Грамматика в этом видео

Конструкции, которые говорящий использует чаще всего, с точными словами из видео:

Конструкция	В видео
«Used to» used to + глагол — прошлая привычка или состояние, которых больше нет	used to collect · used to be · used to spot
Present Perfect have/has + причастие прошедшего времени — прошлое действие, важное сейчас	has shifted · they've scaled · we've established
Пассивный залог be + причастие прошедшего времени — важно, что происходит, а не кто это делает	was connected · is connected · was increased
Придаточные определительные who / which + предложение — уточнение о человеке или предмете	zero, which is · people who do · Somebody who grew

Что такое техника Shadowing?

Shadowing — это научно обоснованная техника изучения языка, изначально разработанная для подготовки профессиональных переводчиков и популяризированная полиглотом доктором Александром Аргуэльесом. Метод прост, но эффективен: вы слушаете аудио на английском от носителей языка и немедленно повторяете вслух — как тень, следующая за говорящим с задержкой в 1–2 секунды. В отличие от пассивного прослушивания или грамматических упражнений, Shadowing заставляет мозг и мышцы рта одновременно обрабатывать и воспроизводить реальные речевые паттерны. Исследования показывают, что это значительно улучшает точность произношения, интонацию, ритм, связную речь, понимание на слух и беглость речи — что делает его одним из самых эффективных методов для подготовки к IELTS Speaking и реального общения на английском.

Техника шедоуинга: читать полное пошаговое руководство →

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Что вы узнаете

Слушайте за этими звуками

Говорите как носитель

Грамматика в этом видео

Что такое техника Shadowing?