Python实现密钥密码（加解密）实例详解

 ''' 如密钥短语密码为: university -> univer<em style="color:transparent">来源[email protected]搞@^&代*@码)网</em>sty 明文: abcdefghijklmnopqrstuvwxyz 密文：jklmopqwxzuniverstyabcdfgh '''

 # 构造映射 asc ---> crypt def dic(x): list_x =[] list_z = [] for i in x: list_x.append(ord(i)) for i in range(97,123): if i not in list_x: list_x.append(i) list_ = list_x[26-len(x)-1:] cr = list_+list_x[:26-len(list_)] for i in range(97,123): list_z.append(i) return dict(map(lambda x,y:[x,y],list_z,cr)) # 构造映射 crypt ---> asc def dic_2(x): list_x =[] list_z = [] for i in x: list_x.append(ord(i)) for i in range(97,123): if i not in list_x: list_x.append(i) list_ = list_x[26-len(x)-1:] cr = list_+list_x[:26-len(list_)] for i in range(97,123): list_z.append(i) return dict(map(lambda x,y:[x,y],cr,list_z))

 # 密钥去重 def remove(x): unique_x = [] for i in x: if i not in unique_x: unique_x.append(i) return unique_x

 # 加密 def encode(): x = input('请输入密钥字符：') if not x.isalpha(): print('请输入正确的密钥格式！') exit(0) s = input('请输入明文：') print('加密后字符：',end='') unique_x = remove(x) dic_ = dic(unique_x) for i in s: if i.isspace(): print(' ', end='') else: print(chr(dic_[ord(i)]),end='') # 解密 def decode(): x = input('请输入密钥字符：') if not x.isalpha(): print('请输入正确的密钥格式！') exit(0) s = input('请输入密文：') print('解密后字符：',end='') unique_x = remove(x) dic_ = dic_2(unique_x) for i in s: if i.isspace(): print(' ',end='') else: print(chr(dic_[ord(i)]),end='')

 # 输入指令 answer = input(f'请输入所需的操作：编码/E or 解码/D: ') try: if answer.upper() == 'E': encode() elif answer.upper() == 'D': decode() else: print('输入错误！') except KeyError: print('请正确输入小写字母！')