[問題] 密碼學 3DES 中間的步驟為何用decryption
看板Prob_Solve (計算數學 Problem Solving)作者woody3724 (woody)時間10年前 (2014/03/28 22:48)推噓1(1推 0噓 2→)留言3則, 2人參與討論串1/1
密碼學
3DES的加密三個步驟是
E(加密) -> D(解密) -> E(加密)
原文書題到 (以下英文擷取自課本原文書)
There is no cryptographic significance to the use of decryption for the second
stage of 3DES encryption. Its only advantage is that it allows users of 3DES
to decrypt data encrypted by users of the older single DES:
C = E( K1,D( K1,E( K1, P ) ) ) = E[K,P]
where C = ciphertext
P= plaintext
E[K,X] = encryption of X using key K
D[K,Y] = decryption of Y using key K
看完這段還是不懂為什麼中間的步驟要用解密
尤其是older single DES不懂
謝謝
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