基于国密SM4和SM2的混合密碡算法研究与实现

现代密码技术在保证信息安全中起着至关重要的作用。SM4算法运算速度快，但存在密钥管理复杂并且安全性低的缺点；SM2算法安全性高、密钥管理简单，但存在对大块数据加解密速度慢和效率较低的缺点。提出一种基于SM4和SM2算法的混合加密算法，大量的主体明文数据采用加密速度极快的SM4算法，利用SM2算法加密SM4算法的密钥并和密文一起传输来避免SM4复杂的密钥管理，提高了数据安全性。经理论分析及在同方THD86芯片上的实验验证，该算法方便可行，加密、解密速度快且安全性高，在电子商务和电子政务中的应用具有良好的效果。

Research and Implementation of Hybrid Cipher Algorithm Based on SM4 and SM2

Modern cipher technology plays an important role in information security. SM4 algorithm has high operational speed, but low safety and complex key management. SM2 algorithm has high security and simple key management , but slow chunk data encryption speed and low efficiency. This paper puts forward hybrid encryption algorithm based on SM4 and SM2 algorithms, a large number of subject proclaimed data encrypted by the extremely fast speed SM4 algorithm, the key of SM4 algorithm after encrypted by the SM2 algorithm together with cryptograph transmit to avoid SM4 complex key management, therefore, improves the data security. The theoretical analysis and experimental results on tongfang THD86 chip show that the algorithm is feasible and the encryption and decryption speed is quick and has high safety, and has a good effect on the electronic commercial affairs and electronic Rovernment.