With the continuous development of computer network technology, global informatization has become a general trend of human development. Computer networks have been widely used in national defense and military, economy, telecommunications, securities, commerce and daily life, especially the US network some time ago. The establishment of the war command and the concept of network-centric warfare highlighted the importance of network technology. However, computer networks are vulnerable to attacks by hackers, strangers, malicious software, etc. due to various connections, uneven distribution of terminals, and open and interconnected networks. Therefore, the security and confidentiality of network information is a key issue, and software security is the foundation of computer security and communication security. Even the best firewalls, intrusion detection and anti-virus software, if the software itself is not guaranteed, will not play a role in improving security. 

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