Enhanced a TCP security protocol by using optional fields in TCP header

The Transfer Contrnl Protocol (TCP) itself does not guarantee the security of data that it transmit-:;. Ho.ve er, under some circumstances, the security of CP communication is required, e.g. the client-server communication in banking systems. No, adays, the source socket layer (SSL) protocol is widely used; hO ever, SSL is based on RSA (a public-key cryptographic algorithm) algorithm, , hich would require more computational resource. The,,efore an alternative faster solution utilizing symmetrical algorithm (AES) are proposed to achieve these goals: bidirectional authentication, encrypted data transmission and Integrity check. Moreover, use the optional fields in TCP header for carrying related information and inh·oduced a new device SAM (Secure access module) which provides security-related functionalities: encryption, decryption key-diversification etc.