Abstract:

In the hopping cognitive radio (CR) system, the security is facing a challenge because there does not exist that a server as the credible entity to display the keyboard. So it is necessary to enhance the encrypting system to solve the problem. The paper presents an LDPC error correcting cipher by combining the advanced encryption standard (AES) and LDPC code. The LDPC error correcting cipher, which is based on wide trail strategy, is a six round block cipher that encrypts 128 bit plaintexts, and the key is composed of 128 bit AES secret keys and an LDPC generator matrix. By using the LDPC generator matrix with high performance in the property of diffusion, the LDPC error correcting cipher has a fairly good property in security in fewer rounds. Simulation results show that the processes of encrypting/decrypting have the better performance.