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The question is really about deniable authentication. There might be more than one way for the desiderata to be satisfied in the context given. For example, Alice and Bob could follow this protocol: Alice creates an OpenPGP signing key-pair with a fake name. She sends an encrypted email to Bob with the "public" key attached and instructs him to keep ...


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As long as Bob keeps his private key secret you can simply encrypt everything which only Bob should see with Bobs public key. This also includes the signature, i.e. when sending a mail from Alice to Bob: encrypt the mail with Bobs public key make a detached signature for this mail using Alice private key encrypt this detached signature using Bobs public ...



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