关键词: 对称密钥, 密钥管理, 非对称密钥, 公钥体系, CA认证

Abstract: Cryptography is one of the core technology of information security, meanwhile, key management technology is the foundation of cryptography. key management typically consists of these steps: generation, storage, exchange, update, revocation, control and destroy. In our video surveillance system, the video transmission of each channel also need encryption using symmetric key. However, the traditional key management method is based on the fact that both entities hold the symmetric key jointly. It will be tedious and dangerous potentially in order to ensure exchange of keys is safe and reliable and to prevent password leakage. To solve the problem, a symmetric key management method and a TCP server system is provided. In our system, all symmetric keys are stored in the server. Users can send requests to the server for getting the valid key, Meanwhile, the connection of users and server is certified and encrypted, making the key management efficient, reasonable, and safe.

Key words: symmetric key, key management, asymmetric key, public key infrastructure, CA certificate