qq-22432832

Caesar加密与解密

本文讲述的是加密方式的一种:Caesar加密和解密

Caesar cipher(恺撒密码)

def takelock(str,offset):
    res = ''
    for char in str:
        if 'a' <= char <= 'z':
            res += chr( ord('a') + ((ord(char) - ord('a'))+offset)%26 )
        elif 'A' <= char <='Z':
            res += chr( ord('A') + ((ord(char) - ord('A'))+offset)%26 )
        else:
            res += char
    return res

def unlock(str,offset):
    res = ''
    for char in str:
        if 'a' <= char <= 'z':
            res += chr( ord('a') + (ord(char) - ord('a') - offset) % 26 )
        elif 'A' <= char <= 'Z':
            res += chr( ord('A') + (ord(char) - ord('A') - offset) % 26)
    return res

if __name__ == '__main__':
    while True:
        strs = input('输入str :  ')
        offset = input('输入offset :  ')
        print(takelock(strs,int(offset)))
        strs = input('待解密str :  ')
        offset = input('输入offset :  ')
        print(unlock(strs,int(offset)))
        print('-----------------------------------------------------------------')

posted on 2021-11-01 16:35  春马与夏  阅读(25)  评论(0编辑  收藏  举报  来源

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