# e2ee

###### tags: `tech`,`asyncencrypt`

### what is e2e(end to end)?

https://www.youtube.com/watch?v=jkV1KEJGKRA&ab_channel=Computerphile

make the message cannot be decrypted in transition from source to target.
server only can get the encrypted message.

### how end to end flow?

A <-> server <-> B

1. A,B create pair key(public, private) for themself,
2. A,B exchange pulblic key
3. send the message encrypt with target user public key,(ex. A send message encrypted with B pulbic key, only b can decrypt with it own private key, vice versa.