쉐도잉 연습: The Most Overengineered Part of Your iPhone - 영상으로 영어 말하기 배우기

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This is the most over -engineered part of the iPhone and all it does is unlock your phone.

That spot used to be a thick strip on top of the display,

then it became the notch and now it's the dynamic island which holds the key parts of Face ID.

There's the regular front camera for selfies and next to it a dot projector, a flood illuminator and an infrared camera.

Those last three together are called the true depth camera.

It sounds like a lot just to unlock a phone

but every part of Face ID is there to stop one specific attack.

Let's say someone wants to get into your phone and the first thing they try is a photo of your face.

A photo like that is easy to get because you probably have dozens of them on your Instagram.

With a regular camera, this trick would actually work.

A regular camera only records colors and brightness, so it has no way to tell how far away things are.

For that camera, a sharp printed photo of your face and your real face look almost exactly the same.

Face ID deals with this by measuring distance, which basically means it checks how far every single point of your face is from the phone.

To do that, it uses infrared, which is a kind of light that your eyes can't see, but a special camera can.

When you pick up your phone, the first part that turns on is the flood illuminator.

Its job is to light up your whole face with infrared light, a bit like a flashlight that you can't see.

Thanks to that, the infrared camera can take a clear picture of your face even when you're lying in a completely dark bedroom.

Right after that, the dot projector turns on

and inside it there's a tiny infrared laser with a special

lens in front of it the lens splits the single laser beam into more than 30 ,000 separate dots

and those dots land all over your face.

Then the infrared camera takes a second picture and this time it shows exactly where each dot landed.

So how does a picture of dots turn into distances?

The dot projector and the infrared camera sit a small fixed distance apart from each other

and the phone already knows where each dot would show up in the picture if you pointed it at a flat wall.

Take the dot that lands on the tip of your nose.

Your nose is much closer to the phone than that flat wall would be so in the camera's picture,

this dot shows up shifted to the side.

A dot that lands on your cheek is a little farther away, so it's shifted a little less.

The phone measures the shift for every one of those 30 ,000 dots.

Then it uses basic geometry, which is called triangulation, to turn each shift into a distance.

When you put all of those distances together, you get a 3D map of your face, and this map is called a depth map.

With the printed photo, all of those dots land on the same flat sheet of paper

so the depth map comes out as one flat surface without a nose that sticks out and face ID rejects it.

Since a flat photo doesn't work, the attacker's next idea is to use a real face that looks a lot like yours, for example your brother's.

A depth map alone can't tell two similar faces apart and this is the job of a neural network.

That network gets to know your face when you set up face ID for the first time.

The phone asks you to slowly move your head in a circle and then to do it one more time.

During those two scans, the phone captures your face from a lot of different angles.

The network then turns everything it saw into a long list of numbers, and you can think of that list as a description of your face

From then on, the same thing happens every time you unlock your phone

The network takes the fresh infrared picture and the fresh depth map, and it turns them into a new list of numbers

Then it compares the new list with the one it saved during setup, and if the two lists are close enough to each other,

the phone treats it as a match

According to Apple, the chance that a random stranger's face is close enough to unlock your phone is less than 1 in a million.

But your brother has a much better chance than a random stranger, because he shares a lot of your features, so fooling the camera doesn't work.

And the attacker tries a different approach.

If they manage to hack the phone's software, maybe they can copy your face data out of memory and use it later.

This doesn't work either, because your face data lives in a part of the phone that iOS can't reach.

Inside Apple's main chip, there's a separate small processor called the Secure Enclave, and it has its own memory and even its own operating system.

iOS can't look into that memory at all,

and the only thing it can do is send the Secure Enclave a request and wait for an answer.

Apple built it this way so that even if an attacker takes full control of iOS, they still can't read anything inside the Secure Enclave.

The list of numbers that describes your face is encrypted, and only the Secure Enclave has the key.

That data never leaves your phone and it's not included in your iCloud backup either.

The secure enclave is also the part that actually unlocks your phone.

The files on your iPhone are encrypted and each time you lock the phone,

the keys to your most sensitive files get locked with one more key.

That extra key is kept inside the secure enclave where iOS can't touch it.

When your face matches, the secure enclave uses

that extra key to unlock the keys to your files and only then can iOS open them.

So basically, a successful match gives the phone back the keys to your own data.

Regular apps get even less than iOS does because when your banking app asks for face ID, the only thing it gets back is a yes

or a no. The app never gets to see your face at any point.

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이 레슨의 어휘와 말하기 포인트

이 말하기 레슨은 영상 “The Most Overengineered Part of Your iPhone”을(를) 바탕으로 합니다. 가장 자주 반복되는 단어는 다음과 같습니다: dot, camera, infrared, key, enclave. 이 영상에는 섀도잉할 문장 64개와 단어 1081개가 있습니다. 말하는 구간의 길이는 4:46입니다. 화자는 분당 약 227단어로 빠르게 말하므로 연음과 약하게 발음되는 소리가 많습니다. 단어의 84%가 영어에서 가장 많이 쓰이는 3,000단어에 속합니다. 나머지는 연습 전에 미리 확인해 두세요.

이 영상의 핵심 어휘

영상에 나오는 익혀 둘 만한 단어 15개를 발음, 뜻과 함께 정리했습니다.

단어	발음	뜻
flood 명사	/flʌd/	한물, 홍수
laser 명사	/ˈleɪzɚ/	레이저
lens 명사	/lɛnz/	렌즈
sharp 형용사	/ʃɑɹp/	날카로운
bedroom 명사	/ˈbɛdˌɹum/	침실
sensitive 형용사	/ˈsɛn.sɪt.ɪv/	민감하다
thick 형용사	/θɪk/	두껍다
compare 동사	/kəmˈpɛɚ/	비교하다, 비유하다
capture 동사	/ˈkæp.(t)ʃɚ/	포획하다
sheet 명사	/ʃit/	장, 시트
angle 명사	/ˈæŋ.ɡəl/	각, 각도
chip 명사	/t͡ʃɪp/	칩
leaf 명사	/lif/	잎
backup 명사	/ˈbækˌʌp/	백업
cheek 명사	/t͡ʃiːk/	뻔뻔

영상에 나오는 구동사

단어	발음	뜻
come out 동사	/ˌkʌm ˈaʊt/	나오다
pick up 동사		줍다

이 영상의 문법

화자가 가장 많이 쓰는 문형을 영상 속 실제 표현과 함께 정리했습니다.

문형	영상 속 표현
수동태 be + 과거분사 — 누가 하는지보다 무슨 일이 일어나는지에 초점	are called · is called · is encrypted
관계절 who / which + 절 — 사람이나 사물에 대한 추가 정보	infrared, which is · geometry, which is

주의할 발음

화자는 can't, doesn't, you're 같은 축약형과 약화된 형태를 11번 사용합니다. 들리는 대로 짧게 발음하세요.

“sh”와 “zh” 소리: sharp /ʃɑɹp/, capture /ˈkæp.(t)ʃɚ/, sheet /ʃit/, flashlight /ˈflæʃˌlaɪt/, triangulation /tɹaɪˌæŋɡjʊˈleɪʃən/
긴 단어 — 강세 위치에 주의: geometry /d͡ʒiˈɑ.mə.tɹi/, triangulation /tɹaɪˌæŋɡjʊˈleɪʃən/

한국어 화자가 어려워하는 소리:

/f/ — ㅍ(/p/)으로 바꾸지 말고 윗니를 아랫입술에 대기: infrared /ˌɪnfɹəˈɹɛd/, flood /flʌd/, leaf /lif/, selfie /ˈsɛlfi/, flashlight /ˈflæʃˌlaɪt/
/v/ — ㅂ(/b/)과 구별하기: sensitive /ˈsɛn.sɪt.ɪv/, enclave /ˈɑnkleɪv/
/z/ — ㅈ이 아니라 성대를 울리는 /s/: laser /ˈleɪzɚ/, lens /lɛnz/

이 영상으로 연습하는 방법

먼저 말하지 않고 영상을 끝까지 듣고 모르는 단어를 적어 둡니다.
0.75배속으로 한 문장씩 섀도잉을 시작하고, 익숙해지면 보통 속도로 돌아갑니다.
자신의 목소리를 녹음해 원본과 비교하고, flood, laser, lens 같은 단어에 특히 주의합니다.

쉐도잉이란? 영어 실력을 빠르게 키우는 과학적 방법

쉐도잉(Shadowing)은 원래 전문 통역사 훈련을 위해 개발된 언어 학습 기법으로, 다언어 학자인 Dr. Alexander Arguelles에 의해 대중화된 방법입니다. 핵심 원리는 간단하지만 매우 강력합니다: 원어민의 영어를 들으면서 1~2초의 짧은 지연으로 즉시 소리 내어 따라 말하는 것——마치 '그림자(shadow)'처럼 화자를 따라가는 것입니다. 문법 공부나 수동적인 청취와 달리, 쉐도잉은 뇌와 입 근육이 동시에 실시간으로 영어를 처리하고 재현하도록 훈련합니다. 연구에 따르면 이 방법은 발음 정확도, 억양, 리듬, 연음, 청취력, 말하기 유창성을 크게 향상시킵니다. IELTS 스피킹 준비와 자연스러운 영어 소통을 원하는 분들에게 특히 효과적입니다.

섀도잉 방법: 단계별 전체 가이드 읽기 →

쉐도잉 연습: The Most Overengineered Part of Your iPhone - 영상으로 영어 말하기 배우기

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