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Without the initial exchange of nonces, an attacker could replay a recorded handshake. Although an attacker can't use this to replay actual packets, an attacker could possibly execute a denial of service attack if the process protected by spiped is not expecting a large number of connections. The attack (assuming a modified spiped protocol that MACs the ...


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Without the nonces, one could violate explicit authentication by replaying the group_element || MAC_tag messages.



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