data encryption standard in c

RSA是目前最有影响力的公钥加密算法，它能够抵抗到目前为止已知的绝大多数密码攻击，已被ISO推荐为公钥数据加密标准-RSA is the most influential public key encryption algorithm, it can resist so far known most of the password attacks, ISO has been recommended as the public key data encryption standard