A.Repetitive encryption obscures any repeated patterns that may have been present in the plaintext.反復加密以掩蓋任何可能在明文出現(xiàn)的重復模式
B.The previous DES output is used as input.之前的DES加密輸出被用來作為輸入
C.Individual characters are encoded by combining output from earlier encryption routines with plaintext.單個字符從之前明文加密程序的結(jié)合輸出來進行編碼
D.A given block of plaintext and a given key will always produce the same ciphertext.一個給定的明文和一個給定的密鑰將總是產(chǎn)生相同的密文。