密碼學學習(一) Python實現兩個簡單的密碼編譯演算法

字串倒序輸出

顧名思義= =|

# !python3.3def stringReverse(s):    """    @param s: string    @return: reversed string    @example:    stringReverse('abc')    output cba    """    return s[::-1]  #start:end:step

凱撒密碼 把字母替換為之後第key個字母，如key=3的話則 a -> d b -> e c -> f ...

# !python3.3def caesarCipher(s, key):    """    @param s: text needs encrypt/decrypt    @param key: positive if encryption, negative if decryption    @return: the encrypted or decrypted text       """    import string    a = string.ascii_lowercase    b = string.ascii_uppercase    key = key % 26      #key must be within 0 - 25    ta = a[key:] + a[:key]    tb = b[key:] + b[:key]    table = s.maketrans(a+b, ta+tb)    return s.translate(table)

Bouns

http://www.blisstonia.com/software/WebDecrypto/index.php

只要是替換密碼（就是簡單地把一個字母替換成另一個字母的加密方式），這個網站一定能給你一個美妙的答案 :)

http://www.ssynth.co.uk/~gay/anagram.html

http://wordsmith.org/anagram/

把字母重新組成單詞，例如把 rehipc 重組成 cipher