If the following message is sent from server to client[[IDA ,TSA , IDB ,TSB H(IDA, TSA, IDB ,TSB )]KB- CHA12’,CHB12, OTP]KA This is typical example ofa.Two Factor mutual authentication protocolb.Mutual Authentication protocolc.Unilateral Authentication protocold.Multifactor authentication Protocol
Question
If the following message is sent from server to client[[IDA ,TSA , IDB ,TSB H(IDA, TSA, IDB ,TSB )]KB- CHA12’,CHB12, OTP]KA This is typical example ofa.Two Factor mutual authentication protocolb.Mutual Authentication protocolc.Unilateral Authentication protocold.Multifactor authentication Protocol
Solution
This is a typical example of a Mutual Authentication protocol. In this protocol, both the server and the client authenticate each other. The server sends its ID (IDA) and timestamp (TSA) along with the client's ID (IDB) and timestamp (TSB). These are hashed and encrypted with the client's public key (KB). The client then sends back its own ID and timestamp, along with a one-time password (OTP), encrypted with the server's public key (KA). This ensures that both parties are who they claim to be.
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