Modified key agreement protocol based on the digital signature standard

Arazi (1993) proposed a scheme to integrate a key exchange protocol into the DSS (digital signature standard) to authenticate two public keys exchanged between two users. Then one corresponding secret session key can be shared by two parties based on the Diffie-Hellman public-key distribution scheme. Later, Nyberg and Rueppel (1994) pointed out a weakness in the Arazi protocol: if one secret session key is compromised then the others will be disclosed as well. The letter proposes a modified key agreement protocol based on the DSS