Tatebayashi, Matsuzaki, and Newman (TMN) proposed the following protocol, which enables Alice and Bob to establish a shared symmetric key K with the

Tatebayashi, Matsuzaki, and Newman (TMN) proposed the following protocol, which enables Alice and Bob to establish a shared symmetric key K with the help of a trusted server S. Both Alice and Bob know the server’s public key Ks. Alice randomly generates a temporary secret KA, while Bob randomly generates the new key K to be shared with Alice. The protocol then proceeds as follows: