Python实现密钥密码（加解密）

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