认知系统AES-LDPC纠错加密器的设计与性能分析  

Design and performance analysis of AES-LDPC error correcting cipher for cognitive radio systems

作　　者：鲁凌云[1] 肖扬[1] 姜月秋[2] 宋丽丽[1] 

机构地区：[1]北京交通大学信息科学研究所,北京100044 [2]沈阳理工大学信息通信工程学院,辽宁沈阳110168

出　　处：《系统工程与电子技术》2010年第1期195-199,共5页Systems Engineering and Electronics

基　　金：国家自然科学基金(60572093)资助课题

摘　　要：在多跳的认知系统中,由于不存在可信实体作为服务器控制密钥分发,安全性将面临更大挑战,需要建立完善的加密体系结构来解决这一问题。将高级加密标准AES和在通信纠错领域性能优异的低密度奇偶校验码(low-density parity-check,LDPC)结合,设计出了分组长度为128 bit的六轮宽轨迹加密策略、密钥由128 bitAES密钥和LDPC生成矩阵组成的LDPC纠错加密器。由于LDPC生成矩阵具有更好的扩散性能,使得这种新设计的LDPC纠错加密器能在更少的轮数下具有较好的安全性。最后,通过实验结果验证了AES-LDPC纠错加密器的性能。In the bopping 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 eneryption 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 enerypting/decrypting have the better performance.

关 键 词：认知无线电 高级加密标准 LDPC编码 交织干扰器 

分 类 号：TN911.2[电子电信—通信与信息系统]