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What is End-to-End Encryption?

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Engineering Notes · Security

The messaging app uses end-to-end encryption, so the provider cannot read what its users send.

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Overview

End-to-end encryption scrambles a message on the sender's device and unscrambles it only on the recipient's, so nobody in between can read it. That includes the company running the service, which carries the message without being able to open it. It protects what you say, not the fact that you said it.
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Overview

Your message gets locked on your handset and only opens on the handset of whoever you sent it to, which means everyone in the middle is carrying something they cannot read, the app makers included. It hides what you said. It does not hide who you said it to, or when. 😎

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Detail

Almost every service already encrypts your messages, so it is worth being precise about what the extra words buy you. With ordinary encryption the company holds a key. That means it can read what you send whenever it chooses to, or whenever a court requires it. End-to-end encryption moves the lock and the key onto the two handsets, the sender's and the recipient's, and the key never leaves them. Everyone in between now carries a sealed package they cannot open, the wifi and the internet provider and the company's own servers alike. What this still does not cover is the outside of the envelope, so who you contacted, when and how often all stay visible. That pattern frequently says more than the words would. It also stops helping the moment a message sits on an unlocked phone, because somebody is then simply reading the screen.
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Detail

Everything claims to be encrypted now, so start with what that usually buys you. The firm keeps a key and can read your messages whenever it fancies, or whenever a judge tells it to. The end-to-end sort keeps the key in exactly two places, your handset and the other person's, and nowhere else ever. Everyone in the middle is stuck hauling a locked box they have no way into. What the lock leaves alone is the label on the outside, so the fact that you messaged that particular person eleven times last night is still perfectly legible. And none of it helps once somebody is holding your unlocked phone, because they are just reading the screen the way you do. 😎

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Analogy

Sending a sealed letter through the post rather than a postcard. The postal service moves both, but it can read the postcard as it goes and cannot read the letter, and that difference is decided when you seal it and not by any promise from the post office. What the post office can always see is the outside: your address, the recipient's, and the date. A stack of envelopes to the same address tells a story even if every letter stays sealed.
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Analogy

Whispering to someone in a crowded room instead of shouting across it. Nobody catches what you said, and that part genuinely works. What everybody in the room did see is that you walked over to that one specific person and leaned in for a while, twice this evening. The content is safe and the meeting is not, and often the meeting was the interesting part.
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Formal definition — The same term, explained the usual way

End-to-end encryption is a scheme in which plaintext is encrypted on the originating device and decrypted only on the recipient device, with key material never available to intermediaries including the service operator. It protects message content against interception and compelled provider disclosure, but does not conceal metadata such as participants, timing and frequency, nor protect against endpoint compromise.

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