ClassicalCipher-密码学教材中几种古典密码的C语言实现

参考-Reference

写之前先学习了ColdmaterL的Caesar-Cipher，参考了其中获取控制台输入的方式，感谢😀。

Learn ColdmaterL's Caesar-Cipher before coding, refered to his way to obtain console input, thanks a lot~😀

简介-Brief Introduction

代码为密码学教材("Cryptography Theory and Practice Third Edition")中几种古典密码的C语言实现。通过控制台程序使用。
因为是初学者，可能难免出现一些错误，如果发现了错误以及不规范之处希望能帮忙指出，非常感谢~

The code is the C language implementation of several classical ciphers in the Cryptography Theory and Practice Third Edition. Use through the console program.
As a beginner, some mistakes may be unavoidable. If you find mistakes and irregularities, I hope you can help me point them out. Thank you very much~

具体实现的古典密码如下:

The classical ciphers are as follows:

代换密码 (Substitution cipher)
- 恺撒密码 (Caesar cipher)
- 移位密码 (Shift cipher)
- 仿射密码 (Affine cipher)
- 单表代换密码 (Monoalphabetic cipher)
- 多表代换密码 (Polyalphabetic cipher)
  - 维吉尼亚密码 (Vigenere cipher)
置换密码 (Permutation cipher)

使用-Tutorial

主菜单-Main Menu
主菜单输入 1 进入代换密码菜单选择
Enter 1 in the main menu to enter the substitution cipher menu
- 代换密码菜单界面输入 1 进入恺撒密码菜单界面
  Substitute cipher menu interface Enter 1 to enter Caesar cipher menu interface
  - 恺撒密码菜单界面输入 1 进行恺撒密码加密
    Enter 1 in Caesar cipher menu interface to encrypt Caesar cipher
  - 恺撒密码菜单界面输入 2 进行恺撒密码解密
    Enter 2 in the Caesar cipher menu interface to decrypt the Caesar cipher
- 代换密码菜单界面输入 2 进入移位密码菜单界面
  Substitution cipher menu interface Enter 2 to enter the shift cipher menu interface
  - 移位密码菜单界面输入 1 进行移位密码加密
    Input 1 in the shift cipher menu interface to encrypt the shift cipher
  - 移位密码菜单界面输入 2 进行移位密码解密
    Input 2 in the shift cipher menu interface to decrypt the shift cipher
- 代换密码菜单界面输入 3 进入仿射密码菜单界面
  Substitution cipher menu interface Enter 3 to enter the affine cipher menu interface
  - 仿射密码菜单界面输入 1 进行仿射密码加密
    Input 1 in the affine cipher menu interface to encrypt the affine cipher
  - 仿射密码菜单界面输入 2 进行仿射密码解密
    Enter 2 in the affine cipher menu interface to decrypt the affine cipher
- 代换密码菜单界面输入 4 进入单表代换密码项，需要先输入密钥
  Enter 4 in the replacement cipher menu interface to enter the single table replacement cipher item. You need to enter the key first
- 输入密钥后进入单表代换密码菜单界面
  Enter the key to enter the single table substitution cipher menu interface
  - 单表代换密码菜单界面输入 1 进行单表代换密码加密
    Input 1 in the menu interface of single table replacement cipher to encrypt the single table replacement cipher
  - 单表代换密码菜单界面输入 2 进行单表代换密码解密
    Single table substitution cipher menu interface, enter 2 to decrypt the single table substitution cipher
- 代换密码菜单界面输入 5 进入多表代换密码菜单界面
  Enter 5 in the substitution cipher menu interface to enter the multi table substitution cipher menu interface
  - 多表代换密码菜单界面输入 1 进入维吉尼亚密码项，需要先输入密钥
    Enter 1 in the menu interface of multi meter substitution cipher to enter the Virginia cipher item. You need to enter the key first
  - 输入密钥后进入维吉尼亚密码菜单
    Enter the key to enter the Virginia cipher menu
  - 维吉尼亚密码菜单界面输入 1 进行维吉尼亚密码加密
    Enter 1 in the Virginia cipher menu interface to encrypt the Virginia cipher
  - 维吉尼亚密码菜单界面输入 2 进行维吉尼亚密码解密
    Enter 2 in the Virginia cipher menu interface to decrypt the Virginia cipher
主菜单输入 2 进入置换密码
Enter 2 in the main menu to enter the replacement cipher
- 按照提示输入密钥后才进入置换密码菜单界面
  Enter the key according to the prompts before entering the replacement cipher menu interface
- 置换密码菜单界面输入 1 进行置换密码加密
  Input 1 in the replacement cipher menu interface to encrypt the replacement cipher
- 置换密码菜单界面输入 2 进行置换密码解密
  Enter 2 in the permutation cipher menu interface to decrypt the permutation cipher