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Information Security

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    You say that the communication is already secured and the purpose of this is not to secure the communication. So then what is the goal here? What are your requirements that are not meant by simply sending Bob's unencrypted message over the secure channel? Commented Aug 2, 2023 at 0:47
  • "Bob will be able to encrypt messages, but won't be able to decrypt them" - it sounds like any scheme hinges on the assumption that Bob doesn't simply remember (store) the message content that he sent. Commented Aug 2, 2023 at 0:50
  • @Bergi it is ok for Bob to access his own messages. It is a scheme where you do not trust Bob with the password itself. Commented Aug 3, 2023 at 7:46
  • But then really you don't need a password for anything at all. Just use the established secure channel. Commented Aug 3, 2023 at 8:43