this post was submitted on 15 Aug 2023
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Explain Like I'm Five

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31
How is the Recipient the Only One Able to Decrypt End to End Encryption? (sopuli.xyz)
submitted 1 year ago by [email protected] to c/[email protected]
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I understand that in end to end encryption the message is encrypted and only the recipient has the key to Decrypt it. How is the key transmitted, and how can the key not get intercepted with the message?

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[–] [email protected] 2 points 8 months ago (2 children)

With Diffie-Hellman, wouldn't the two private keys need to be the same to give the same result?

[–] [email protected] 2 points 8 months ago

No. The wiki article explains it better than I can.

https://en.m.wikipedia.org/wiki/Diffie%E2%80%93Hellman_key_exchange

[–] [email protected] 2 points 3 months ago

The two private keys represent two channels of information flow. One channel for each direction.

When Alice talked to Bob, they’re using Bob’s keys. When Bob talks to Alice, they’re using Alice’s keys.

If it’s a “two-way” conversation, that’s just two separate one-way channels being combined at the end into what seems like a single, two-way channel.