Research On Permutation Code Based Combined Security Algorithm Applied In The Data Transmission System

Network based data transmission security is one of the critical task in information security field. In this paper, a permutation code security algorithm based on the block cipher that is widely used in the data transmission system is put up after carefully studied the current encryption methods. The permutation code encryption and its key management and digital signature by RSA contribute to the high intensity combination security algorithm which is verified by both theory analysis and simulation results with high running speed.Firstly, we discuss the general concepts of computer security and cryptology and describe the mostly used modem encryption methods and public key technologies including other typical algorithms. Secondly, we put up a new combined security algorithm applied in the data transmission at network system on the base of introducing permutation code encryption (a new type of block cipher), and design the transmission system. The system makes full use of the principle of public key, message digest and permutation code accomplished rapidly data encryption and data transmission, digital signature.