symmetric cryptosystem

There are mainly two systems of cryptographic algorithms& the symmetric key cryptosystem and the public key cryptosystem.

目前商用的密码算法主要有两大体系：对称密钥加密体系和公钥加密体系。

Encryption key is different from decryption key for the cryptosystem, therefore, in order to be different from symmetric encryption, which is called Public-Key Cryptosystem.

公钥密码学是加密密钥和解密密钥不同的密码学体系，为了区别加密密钥和解密密钥相同的对称密码系统，故取名为公钥密码。

A symmetric cryptosystem is analyzed and found its loopholes. Then chosen plaintext attack is carried out successfully.

对一种混沌密码系统进行分析，发现该密码系统存在的漏洞，并且证明此密码系统并不能抵抗选择明文攻击。