If Alice send the following message to Bob over insecure channel, The communication link is prone to -------- attack,[[IDA ,TSA ,H(IDA, TSA)]KA-]KB a.Impersonation attackb.Denial of service attackc.Replay attackd.Man in the middle attack
Question
If Alice send the following message to Bob over insecure channel, The communication link is prone to -------- attack,[[IDA ,TSA ,H(IDA, TSA)]KA-]KB a.Impersonation attackb.Denial of service attackc.Replay attackd.Man in the middle attack
Solution
The communication link is prone to a Man in the Middle attack.
Here's why:
In the given scenario, Alice is sending a message to Bob over an insecure channel. The message includes IDA (Alice's ID), TSA (Timestamp), and H(IDA, TSA)KA (Hash of Alice's ID and Timestamp encrypted with Alice's private key) all encrypted with Bob's public key.
A Man in the Middle (MITM) attack is a type of eavesdropping attack where the attacker secretly relays and possibly alters the communication between two parties who believe they are directly communicating with each other.
In this case, an attacker could intercept the message from Alice, decrypt it using Bob's public key, alter the message or insert their own, re-encrypt it with Bob's public key, and then send it on to Bob. Bob would then believe the message came from Alice, when in fact it came from the attacker. This is why the communication link is prone to a Man in the Middle attack.
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