New symmetric key generation algorithm

Two extreme methods are used to overcome the symmetric session key distribution problem via non secure channel. The first one is to store all the desired keys for certain period and change the keys by its index, which will consume very large storage and requires physical update by the end of this period. The other is to make use of secure pseudo random number generator in which its length is long enough to cover the required time period, beside the limitations of the pseudo random number generator length it suffers from synchronization problem. The proposed solution is to mix the two extremes and find a middle way between them to gather only the advantages of both methods. FPGA design to the proposed algorithm is performed using Mentor Graphics FPGA Adv.Pro. The implementation is performed on XILINX Vertex2P, XC2VP30-6ff896 and utilizes % 13 of its resources. The maximum frequency is 184.570 MHz.