Respuesta :
Trudy is able to capture messages 1 and 3 in an actual conversation between Alice and Bob, then play them back at a later time. Trudy records messages 1 and 2, challenges Bob with message R-1, and then replies with message 2 that she previously recorded.
At first, Bob is unsure if he is speaking with Trudy or Alice. Trudy doesn't know about the shared secret key KA-B that Bob and Alice use. Trudy requests Bob's confirmation that she is Alice. Trudy waits for Bob to begin before asking him to verify himself:
1. "I'm Bob," Bob said to Trudy Commentary: Bob begins to prove his identity. Bob takes a few steps back after confirming his identity to the other side.
2. "I am Alice," says Trudy to Bob Commentary: Trudy begins to establish her identity as Alice.
3. "R" from Bob to Trudy Commentary: Bob sends a nonce in reply to the second step.
Since Trudy does not yet know KA-B(R), she is unable to respond.
4. "R" from Trudy to Bob Commentary: Trudy continues after responding to step 1
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