共查询到19条相似文献,搜索用时 93 毫秒
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提出一种新的混沌真彩图像和视频加密算法.在对图像预处理的基础上,应用Henonlsine复合混沌系统产生的混沌序列对预处理后的图像矩阵进行位置置乱和灰度值替代结合的方法加密.通过性能分析,表明该算法具有良好的加密效果.将该算法应用于视频加密之中,并引入"一帧一密"的技术,仿真和通信平台的成功测试表明该算法对视频加密的适用性和良好性能. 相似文献
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一种自适应综合DCT系数置乱加密算法 总被引:1,自引:1,他引:0
提出了一种基于自适应综合DCT系数置乱的视频加密算法。该算法结合了频度域置乱算法、ZigZag置乱算法的优点。自适应DCT系数综合置乱加密算法将两者有机地结合起来,取长补短,在加密可靠性、计算复杂度、对压缩比的影响和抗差错扩展性等几个方面同时具有很高的性能。重点分析了影响该算法性能的几个重要因素,并阐明了确定某些重要的加密参数的原则。通过对这种算法的编程、实验和分析,新算法加密的效果比原来两种加密算法的任意一种都要好。 相似文献
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3G视频会议系统由于受到无线网络开放性的限制,难以满足行业客户的特殊安全需求。现有3G视频会议系统的加密存在着诸多技术困难,其一就是常规加密算法对硬件要求高,时延较大。ECC加密算法可以较好地适应3G视频终端设备的要求,是一种可行的加密算法。针对此应用对ECC算法做进一步的优化能更好地适应3G视频会议系统终端的需求。文章提出了一种基于ECC的快速算法,经证明可以有效降低资源需求,提高速度,达到应用要求。 相似文献
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首先利用RSA加密算法对数据进行加密和解密,实现了数据的安全传输;然后针对RSA加密算法时间开销大和算法设计复杂的缺点,提出基于乘同余对称特性的SMM算法。通过对该改进RSA加密算法的实现发现加密运算速度明显提高且算法更简单,从而证明了本文所提改进算法的有效性。 相似文献
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一种高速安全的改进型CVEA算法 总被引:1,自引:0,他引:1
视频信息处理具有数据量大、冗余度高、实时性要求严格的特点,本文在对原有文献中提到的一些VEA算法进行深入研究的基础上,针对原CVEA算法的不足,提出了一种满足视频应用要求的快速高安全性的基于混沌密钥的视频加密算法.该算法首先在混沌密钥的产生上采用Chebyshev映射和Logistic映射相互迭代产生二值密钥的方法,有效的克服了一维混沌动力系统中的平凡密钥和拟平凡密钥现象,用此密钥对主要视频图像信息进行一次一密完全加密,安全性相当高,有效的避免了已知明文攻击;其次算法中仅有二进制异或运算,密钥存储量小,所以速度很快;再者加密时保留了一些特殊数据,如MPEGⅡ数据中的图组头等信息,所以加密后文件格式不变、大小不变,可以播放;另外,本算法可适用任何压缩后的视频数据格式,可移植性很好. 相似文献
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视频在网络传输过程中需要利用密码进行加密以获得数据的保密性。针对视频存在数据量大和实时性强的特点,提出了一种双混沌自同步流密码算法,以提升加密视频的安全性能和加密效率。密码算法由两个离散时间混沌系统构成:首先,采用混沌反控制方法设计两个三维离散时间混沌系统;然后,将第一个混沌系统的状态变量作为第二个混沌系统的反控制器;最后,将第二个混沌系统迭代产生的状态变量与明文信息进行加密操作。该算法能够有效抵御选择密文攻击与分别征服攻击,具备良好的安全性能。实验测试表明,算法能够达到每秒25帧以上的实时性能,具有良好的加密效率。 相似文献
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Partial encryption of compressed images and videos 总被引:12,自引:0,他引:12
The increased popularity of multimedia applications places a great demand on efficient data storage and transmission techniques. Network communication, especially over a wireless network, can easily be intercepted and must be protected from eavesdroppers. Unfortunately, encryption and decryption are slow, and it is often difficult, if not impossible, to carry out real-time secure image and video communication and processing. Methods have been proposed to combine compression and encryption together to reduce the overall processing time, but they are either insecure or too computationally intensive. We propose a novel solution called partial encryption, in which a secure encryption algorithm is used to encrypt only part of the compressed data. Partial encryption is applied to several image and video compression algorithms in this paper. Only 13-27% of the output from quadtree compression algorithms is encrypted for typical images, and less than 2% is encrypted for 512×512 images compressed by the set partitioning in hierarchical trees (SPIHT) algorithm. The results are similar for video compression, resulting in a significant reduction in encryption and decryption time. The proposed partial encryption schemes are fast, secure, and do not reduce the compression performance of the underlying compression algorithm 相似文献
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随着多媒体技术的不断发展,视频信息安全愈发受到人们的关注。为解决视频信息的安全问题,提出了一种基于现场可编程门阵列(FPGA)技术的超混沌视频加密方法。在加密过程中,一方面FPGA控制数字摄像头实现实时彩色视频信息的采集;另一方面,在计算机密钥指令下,利用FPGA使超混沌系统产生有效的伪随机序列,实现对所采集视频信息的数据和地址的双重超混沌加密。给出了具体的超混沌视频加密算法和设计流程以及FPGA实现结果。安全性分析表明,明密文主观视觉对比显著不同,密钥空间大,视频图像统计特性的相关性弱,说明基于FPGA的超混沌视频加密系统加密效果良好可靠。 相似文献
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An improved H.264/AVC comprehensive video encryption scheme is proposed. In the proposed scheme, the intra-prediction mode, motion vector difference, and quantization coefficients are encrypted. A novel hierarchical key generation method is likewise proposed, in which the encryption keys are generated based on the cryptographic hash function. Generated frame keys are consistent with the corresponding frame serial numbers, which can ensure frame synchronization in the decrypting process when frame loss occurs. This function provides the property that our scheme is secure against some special attacks for video, such as the frame regrouping attack and frame erasure attack. Our method not only avoids the distribution of encryption keys, but also increases the security. Experimental results show that the proposed scheme is efficient in computing, the encryption process does not affect the compression ratio greatly, and the encryption/decryption process hardly affects the video quality. 相似文献
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Security video communication is a challenging task, especially for wireless video applications. An efficient security multimedia system on embedded platform is designed. By analyzing the hardware architecture and resource, the efficient DSP-based H.264/AVC coding is studied by efficient video coding techniques and system optimizing implementation.To protect the confidentiality and integrity of media information, a novel security mechanism is presented, which includes user identify authentication and a perceptual video encryption algorithm based on exploiting the special feature of entropy coding in H.264. Experimental results show that the proposed hardware framework has high performance and achieves a better balance between security and efficiency. The proposed security mechanism can achieve high security and low complexity cost, and has a little effect on the compression ratio and transmission bandwidth. What’s more, encoding and encryption at the same time, the performance of data process can meet real-time application. 相似文献