基于压缩感知和超混沌系统的多图像加密算法①白牡丹,赵莉,李珊珊(长安大学信息工程学院,西安710064)通信作者:李珊珊,E-mail:sputnik@126.com摘要:为了有效改善传输速率并降低带宽负担,提出一种基于压缩感知和超混沌系统的多图像加密方案.首先将多幅原始图像拼接成新的明文图像,并将部分明文信息与随机正整数结合产生混沌系统初始值,利用超混沌系统产生的伪随机序列生成加密过程所需的测量矩阵、置乱序列及扩散序列.其次通过离散小波变换、阈值处理以及并行测量对明文图像进行压缩处理,有效减少运算数据量,大大加快运行速率.最后通过无重复置乱操作和双向加模扩散得到最终的密文图像.经多个层面的仿真模拟实验,验证了所提算法能有效抵御剪切攻击,且具有比较高的安全性.关键词:多图像加密;压缩感知;超混沌系统;像素置乱;扩散引用格式:白牡丹,赵莉,李珊珊.基于压缩感知和超混沌系统的多图像加密算法.计算机系统应用,2023,32(2):295–302.http://www.c-s-a.org.cn/1003-3254/8935.htmlMultiple-imageEncryptionAlgorithmBasedonCompressedSensingandHyperchaoticSystemBAIMu-Dan,ZHAOLi,LIShan-Shan(CollegeofInformationEngineering,Chang’anUniversity,Xi’an710064,China)Abstract:Toeffectivelyimprovethetransmissionrateandreducebandwidthburden,thisstudyproposesamultiple-imageencryptionschemebasedoncompressedsensingandahyperchaoticsystem.Specifically,severaloriginalimagesaresplicedintoanewplaintextimage,andsomeplaintextinformationiscombinedwithrandompositiveintegerstogeneratetheinitialvalueofthechaoticsystem.Thepseudo-randomsequencegeneratedbythehyperchaoticsystemisutilizedtoproducethemeasurementmatrix,scrambledsequence,anddiffusionsequencetheencryptionprocessneeds.Then,discretewavelettransform,thresholding,andparallelmeasurementareperformedtocompresstheplaintextimage,whichcaneffectivelyreducetheamountofoperationdataandgreatlyspeeduptheoperationspeed.Finally,thefinalciphertextimageisobtainedbynon-repeatedscramblingandbidirectionalmode-addingdiffusion.Multiplelevelsofsimulationexperimentsverifythattheproposedalgorithmcaneffectivelyresistcroppingattacksandofferhighsecurity.Keywords:multiple-imageencryption;compressedsensing;hyperchaoticsystem;pixelscramblin...
