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首页> 外文期刊>International journal of bifurcation and chaos in applied sciences and engineering >Cryptanalysis of a Chaotic Stream Cipher and Its Improved Scheme
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Cryptanalysis of a Chaotic Stream Cipher and Its Improved Scheme

机译：混沌流密码的密码分析及其改进方案

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In this paper, the security performance for an 8D self-synchronous and feedback-based chaotic stream cipher with the low 8 bits of state variables for encryption is analyzed. According to known-plaintext attack and divide-and-conquer attack, only the second plain-pixel and its corresponding cipher-pixel are required to decipher the secret keys a1i,a2i,a3i (i = 1, 2,…, 8) by properly setting 64 different kinds of initial conditions. Then, according to chosen-ciphertext attack and divide-and-conquer attack, it is found that under the condition of selecting the ciphertext as zero, the original chaotic equation is degenerated as a linear one. So, by setting appropriate initial conditions, the secret keys a4i,a5i,a6i,a7i,a8i (i = 4, 5, 6, 7, 8) can be deciphered with only four iterative operations. As for the secret keys a4i,a5i,a6i,a7i,a8i (i = 1, 2, 3) multiplied by ciphertext and the secret keys σi,??i (i = 1, 2, 3) related to nonlinear functions, maybe a more powerful attack method is required for these secret keys to be deciphered. Finally, an improved chaotic stream cipher scheme equipped with the low 8 bits derived from nonlinear operation of multiple state variables for encryption is proposed for improving the ability to resist divide-and-conquer attack and chosen-ciphertext attack.
机译：在本文中，分析了8D自同步和基于反馈的混沌流密码的安全性能，具有用于加密的8位的8位。根据已知的明文攻击和划分和征服攻击，仅需要第二纯片像素及其相应的密码像素来破译秘密键A1I，A2i，A3i（i = 1,2，...，8）正确设置64种不同类型的初始条件。然后，根据所选择的密文攻击和分行和征服攻击，发现在选择密文的条件下为零，原始混沌方程作为线性redenear。因此，通过设置适当的初始条件，可以仅利用四个迭代操作来解密秘密键A4i，A5i，A6i，A7i，A8i（i = 4,5,6,6,8）。至于秘密键A4i，a5i，a6i，a7i，a8i（i = 1,2,3）乘以密文和秘密键Σi，?? i（i = 1,2,3）与非线性函数相关，也许这些秘密密钥要破译需要更强大的攻击方法。最后，提出了一种配备有来自多个状态变量的非线性操作的低8位进行加密的改进的混沌流密码方案，以提高抵抗分行和征服攻击和所选密文攻击的能力。

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