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上传时间: 2012-03-21
详细说明： Requirement: This exercise is writing a program in Java using JCE which implements message authentication protocol shown as a variant b 9 of lecture notes on Message Authentication and Hash Functions. You need to implement a program which models activities of two participants, Sender and Verifier. Example for the program: SenderSender SenderSender , it needs to do, it needs to do , it needs to do , it needs to do , it needs to do , it needs to do , it needs to do: • takes a text of the message, in this example I use the message “test the prog.” • calculates the message digest (hash function) using SHA-1 algorithm; • generates a pair of RSA private/public keys; and encrypts the produced digest (hash) with a private key; • passes the original message, encrypted digest and public key to the Verifier. • recalculates a new digest from the text of the message he has recieved; • compares these two digests. If the message is transferrin So, the program is able to verifier will detect the attack of Adversary, which is placed in between Sender and Verifier and may change either the original message, or encrypted digest, or both ...展开收缩
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