python提供了普莱菲尔密码的加解密包：pycipher

下载地址：

安装：python setup.py install

基本使用：

from pycipher import Playfairprint Playfair('CULTREABDFGHIKMNOPQSVWXYZ').encipher('THE QUICK BROWN FOX JUMPS OVER THE LAZY DOG')print Playfair('CULTREABDFGHIKMNOPQSVWXYZ').decipher('UKDNLHTGFLWUSEPWHLISNPCGCRGAUBVZAQIV')

输出：

UKDNLHTGFLWUSEPWHLISNPCGCRGAUBVZAQIV

THEQUICKBROWNFOXIUMPSOVERTHELAZYDOGX

# *-* coding=utf-8*-*import stringdef key_deal(key):    strs = ''    key = string.lower(key)    for i in key:        if i in strs:            pass        else:            strs = strs + i    return strsdef get_matrix(key):    matrix = [([''] * 5) for i in range(5)]    temp = key_deal(key)    # print temp    charset = string.lowercase    dic = {chr(i+96): i for i in range(1, 27)}    a = -1    b = -1    k = 0    m = 0    for j in range(5):  # 列        for i in range(5):  # 行            if k < len(temp):                if dic.get(temp[k]) == 9 or dic.get(temp[k]) == 10:                    a = i                    b = j                    matrix[i][j] = temp[k]                    # print i, j, a, b, k, temp[k], matrix[i][j]                    k += 1                    continue                else:                    matrix[i][j] = temp[k]                    # print i, j, a, b, k, temp[k], matrix[i][j]                    k += 1                    continue            else:                while m < len(dic):                    if dic.get(charset[m]) == 9 or dic.get(charset[m]) == 10:                        if a != -1 or b != -1:                            matrix[a][b] = matrix[a][b] + charset[m]                            m += 1   # matrix[i][j]还没定，需要继续                        else:                            matrix[i][j] = charset[m]                            a = i                            b = j                            # print i, j, a, b, m, charset[m], matrix[i][j]                            m += 1                            break                    else:                        if charset[m] in temp:                            m += 1                        else:                            matrix[i][j] = charset[m]                            # print i, j, a, b, m, charset[m], matrix[i][j]                            m += 1                            break    # for i in range(5):    #     for j in range(5):    #         print i, j, matrix[i][j]    # return matrixif __name__ == '__main__':    key = 'CULTURE'    matrix = get_matrix(key)    plaintext = 'THE QUICK BROWN FOX JUMPS OVER THE LAZY DOG'    strs = string.lower(''.join(plaintext.split(' ')))    if len(strs) % 2 != 0:        strs += 'x'    print strs