[problem description] : to implement a secure network identity system, used for identity authentication, resistant to most of the attacks, reference function requirement: 1. Can resist replay attack, can use a serial number, timestamps, reply response, stream cipher, password feedback mechanisms such as; 2. The authentication information in the network can be encrypted; 3. You can use the public key mechanism Shared authentication information,

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Lu had

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Anxious for the o brother will hand in the homework