Question: Design a protocol in which Bob chooses whether to require Alice to send a cookie (see 14.5.1 Cookies). As mentioned in 14.6 Endpoint Identifier Hiding,

Design a protocol in which Bob chooses whether to require Alice to send a cookie (see 14.5.1 Cookies).

As mentioned in 14.6 Endpoint Identifier Hiding, it is possible to design a protocol that will hide both identifiers from an active attacker, assuming that Alice (the initiator) already knows Bobs public key. Show such a protocol.

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