Encrypt Mode and the Security of Cryptographic Protocol
Pla Information · Computer Engineering and Applications Journal · 2006
Design and analysis of secure cryptographic protocol is very difficult,we always suppose that the cryptographic algorithm which is used in cryptographic protocols is securely.We always ignore the effect of what kind of encrypt mode used by the cryptographic algorithm.Aiming at an amended Needham-schroeder protocol,we have supposed it uses DES as its encrypt algorithm and CBC mode as its encrypt mode.Through using an old message's ciphertext and plaintext to amend current message that an adversary successfully cheat both sides of user and agreed two new session keys with every sides of user,so the adversary can attack this protocol successfully.So we can drew the conclusion that the mode of the cryptographic algorithm can affect the security of cryptographic protocols seriously.