Purpose of key evolution? When generating and exchanging keys, what is the purpose of performing key evolution after public key exchange + authenticated encryption?
I believe that the purpose of performing key evolution after the public key exchange and authenticated encryption is to provide forward secrecy. While generating and exchanging keys there are two security objectives. First, partial send deniability, which is provided by the public key exchange and authenticated encryption. Second, the forward and backward secrecy, provided by the key evolution.