Weaknesses of some ID Clause Samples

Weaknesses of some ID based remote user authentication and key agreement schemes 3.1. Common security weaknesses 3.1.1. Insider attack Insider attack is that the client’s private key is derived by the privileged insider of the server. Observing the Client registration phase of these schemes [6, 7, 8, 9, 10, 11, 12], the privileged insider of the server who usually owns the master key s of the sever can easily compute the client’s private key. Hence, these schemes fail to resist insider attack. 3.1.2. Failure to provide mutual authentication From the analysis in Section 3.1.1, a privileged insider of the server can know all clients’ private keys. Once the attacker derives the client C’s private key, he can impersonate C to access the server just selecting a random number rC ∈ Z∗ and performing the following steps of these schemes in user authentication and key agreement phase. Therefore, a privileged insider of the server can impersonate any client to access the server, that is, these schemes cannot provide the client-to-server authentication. Hence, these schemes fail to provide mutual authentication.
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Related to Weaknesses of some ID

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