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Loris Guerra17,536 Points
Confusion about Shared Secret Key
In this example, if Bob and Alice agree together on a Shared-Secret-Key that they use to encrypt messages, (and this Shared-Key is also switched-changed often), how could they still decrypt all the messages using their own private key?
Steven Parker221,963 Points
They wouldn't need a private key if they do symmetric encryption.
The shared key would be the only key needed to encrypt and decrypt the messages. Changing it often prevents someone who manages to acquire it from reading their entire message history, or messages they generate in the future after the next change.
If they were using private keys, they would not use a shared key. Each of them would have a unique private key and a public key (4 keys total).
Patrick Palmowski4,042 Points
Now I´m confused, do they use a public key now? Because why would they use a shared private key, it just has the characteristics like a public key. Am I so wrong?