Python实现密钥密码(加解密)实例详解
密钥密码
''' 如密钥短语密码为: university -> universty 明文: abcdefghijklmnopqrstuvwxyz 密文:jklmopqwxzuniverstyabcdfgh '''
构造映射字典
# 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
# 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
加解密
# 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='')
程序入口
# 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!')
实现效果
注:可以输入空格
输出大小写:请自行修改
请输入所需的操作:编码/E or 解码/D: e
请输入密钥字符:university
请输入明文:abcdefghijklmnopqrstuvwxyz
加密后字符:jklmopqwxzuniverstyabcdfgh请输入所需的操作:编码/E or 解码/D: d
请输入密钥字符:university
请输入密文:jklmopqwxzuniverstyabcdfgh
解密后字符:abcdefghijklmnopqrstuvwxyz
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