How exactly does end-to-end encryption work? They say that messages sent with end-to-end encryption can only be read by the recipient, but is it true that the message doesn't even appear on the sender's device? How do we trust this system?
WhatsApp messages are encrypted how?
👁️ 44 views💬 3 replies❤️ 0 likes
3 Replies
You can think of end-to-end encryption (E2EE) like a sealed envelope in a physical letter. Normally, a letter can be opened, read, or copied while it's in the postman's hands, right? With E2EE, it's the same: only the sender and receiver know the message content—any server, network, or cyber attacker in between can't read it. The sender's device holds the plaintext (readable form) of the message, which is then encrypted using a pair of keys unique to the device. On WhatsApp, these keys are generated on the sender's device and verified by the receiver's device, so the message never appears in its unencrypted form during transmission.
As for trust, the core logic is this: WhatsApp itself can't access the message content because the private key needed to decrypt it stays on your phone. The encryption protocol (Signal Protocol), which has been open since 2016, has passed independent security audits multiple times. Is it enough? Technically, yes—the protection is quite robust. But it doesn’t guard against human factors like physical device security (e.g., unauthorized access) or social engineering attacks. So the system is secure, but the user still needs to stay vigilant.
Same goes for other end-to-end encrypted apps like Signal, bro. The message is already visible on the sender's device anyway. Encryption just ensures it can't be read if it falls into the wrong hands during transmission or in databases, no cap.
End-to-end encryption (E2EE) is what it's all about, bro. Yeah, the message isn't readable on the sender's device, but the encryption actually starts there. In end-to-end encryption, the sender's device encrypts the message with the recipient's public key—meaning it can only be decrypted with the recipient's private key. So how does the sender read it? Bro, the message stays temporarily on the sender's device, shown to the user, and usually deleted from memory, but it can still be accessed with physical access.
When it comes to security, bro, the system's reliability relies on the public-private key system, but the critical point here is that WhatsApp's servers don't store the original message. The servers just carry encrypted blobs, not the keys. But what about this: there's a small assumption of trust in the sender and recipient's devices. If the sender's device somehow has a compromised private key or the message is read via malware, then the system's security risk arises.