Cryptanalysis of a spatiotemporal chaotic image/video cryptosystem
Cryptanalysis of a spatiotemporal chaotic image/video cryptosystem
复制标题
DOI：
10.1016/j.physleta.2008.07.042
复制
发表时间：
2008-09-01
影响因子：
2.6
通讯作者：
Belghith, Safya
中科院分区：
文献类型：
--
作者：
Rhouma, Rhouma;Belghith, Safya
这封信提出了两种不同的攻击最近提出的混沌密码系统的图像和视频在[S。Lian，Chaos Solitons Fractals（2007），doi：10.1016/j.chaos.2007.10.054].所研究的密码系统在密钥流的生成方面显示出弱点。加密是通过在CBC模式设计中生成与从明文和密文生成的块混合的密钥流来进行的。如此获得的密钥流对于每个加密过程保持不变。猜测密钥流导致猜测密钥。两种可能的攻击，然后能够打破整个密码系统的基础上，在生成密钥流的这个缺点。我们还建议改变密码系统的描述，使其在PCBC模式设计中对所描述的攻击具有鲁棒性。(C)2008 Elsevier B. V.保留所有权利。
This Letter proposes two different attacks on a recently proposed chaotic cryptosystem for images and videos in [S. Lian, Chaos Solitons Fractals (2007), doi: 10.1016/j.chaos.2007.10.054]. The cryptosystem under study displays weakness in the generation of the keystream. The encryption is made by generating a keystream mixed with blocks generated from the plaintext and the ciphertext in a CBC mode design. The so obtained keystream remains unchanged for every encryption procedure. Guessing the keystream leads to guessing the key. Two possible attacks are then able to break the whole cryptosystem based on this drawback in generating the keystream. We propose also to change the description of the cryptosystem to be robust against the described attacks by making it in a PCBC mode design. (C) 2008 Elsevier B.V. All rights reserved.