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Session Key Exchange Algorithm - Finding the Security Flaw

cn flag

The protocol shown in the Figure is open for an attack that will let an attacker learn the secret value from the server without having to know the key Kcs. Can anyone help in finding such an attack? Only, the client C and server S share the symmetric key Kcs. Regards.

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Daniel S avatar
ru flag
HINT: you might like to reflect on the fact that this protocol has a lot of symmetry.
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