通过编程实现S-DES算法的加密与解密过程，从而加深对这一算法过程的印象，并增强编程解决问题能力，为进行更复杂的算法学习奠定基础。-programming through S-DES algorithm for the encryption and decryption process. enhance the algorithm to process the impression that the enhanced programming and problem-solving abiliti