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Security issues play an important role in modern communication worlds. Via distrusted networks, exchanged messages need to be encrypted by a session key for security requirements. Session keys are preferred to be generated by communication parties, and how to authenticate the other communication party is an important problem needed to be solved. In three-party encrypted key exchange (3PEKE) protocols,...
RSA is a popular public key cryptology for encryption and signing messages. In 2008, Harn and Ren introduced a new identity-based RSA multi-signature scheme by adopting Shamir's signature scheme. But, we find that there are some flaws in their proposal: First, the original signer's signing secret key can be derived. Second, the verification equation will never hold even if the received signature and...
Recently, Wang et al. proposed a new dynamic ID-based remote user authentication scheme which is an improvement of Das et al.'s scheme. They claimed their scheme is efficient and secure. After thorough analyses, we find Wang et al.'s scheme suffers from masquerade attacks because an attacker can choose an identity at will and be authenticated by the remote server successfully. In this paper, we will...
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