[請問] 兩題資安導論 elgamal / RSA

作者irenelove (irenelove)

看板ask

標題[請問] 兩題資安導論 elgamal / RSA

時間Tue Jan 20 03:14:20 2015

Q1: Consider an ElGamal scheme between Alice and Bob with a common prime q=71 and a primitive root α=7. 1. If Bob has public key Y_B=3 and Alice chooses the random integer k=2, what is the ciphertext of M=30? 2. 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? Q2: 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. 看完投影片還是不太會寫不知道那些代號是什麼跪求幫忙> < -- ※ 發信站: 批踢踢實業坊(ptt.cc), 來自: 223.136.137.200 ※ 文章網址: https://www.ptt.cc/bbs/ask/M.1421694864.A.999.html

→ irenelove: Ps這是考古題不是作業 01/20 03:23

→ sixthday: 為什麼我覺得是沒認真看...隨便估狗也看到一堆範例 01/20 03:24

→ irenelove: 因為明早就要考了看不完QQ 01/20 03:32

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標題: [請問] 兩題資安導論 elgamal / RSA 時間: Tue Jan 20 03:14:20 2015 Q1: Consider an ElGamal scheme between Alice and Bob with a common prime q=71 and a primitive root α=7. 1. If Bob has public key Y_B=3 and Alice chooses the random integer k=2, what is the ciphertext of M=30? 2. 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? Q2: 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. 看完投影片還是不太會寫不知道那些代號是什麼跪求幫忙> < -- ※ 發信站: 批踢踢實業坊(ptt.cc), 來自: 223.136.137.200 ※ 文章網址: https://www.ptt.cc/bbs/ask/M.1421694864.A.999.html

→ irenelove: Ps這是考古題不是作業 01/20 03:23

→ sixthday: 為什麼我覺得是沒認真看...隨便估狗也看到一堆範例 01/20 03:24

→ irenelove: 因為明早就要考了看不完QQ 01/20 03:32