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(已解決 謝謝大家) (10%) Consider an ElGamal scheme between Alice and Bob with a common prime q=71 and a primitive root α=7. If Bob has public key Y_B=3 and Alice chooses the random integer k=2, what is the ciphertext of M=30? If Alice now chooses a different value of k so that the encoding of M=30 is C=(59,C_2 ), what is the integer C_2? (10%) Suppose Alice and Bob use a RSA with p q n e Alice 11 5 55 9 Bob 13 7 91 11 Alice want to send plaintext x=5 to Bob by using both RSA encryption and digital signature. Please note that only plaintext is used for RSA encryption. Please show the ciphertext y, signature s, and how Bob ensure this message is sent by Alice. 不好意思剛剛想說已有板友回文就把文章內文清空 因為發現會踩板規 所以現在把內容貼回來 但有不小心刪到一位板友的推文 sorry ※ 編輯: irenelove (223.136.137.200), 01/20/2015 03:42:26 ※ 編輯: irenelove (223.136.137.200), 01/20/2015 03:43:07 ※ 編輯: irenelove (223.136.137.200), 01/20/2015 03:43:56

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