基于类DNA编码分组与替换的加密方案

传统加密方案一般基于香农提出的置乱和分散理论进行设计,实验证明,基于位面的图像加密方案具有更好的有效性.该文提出一种新颖的位面层次的基于编码分组与替换的加密算法.该算法首先依据DNA编码以及中心法则对原始媒体进行编码,然后利用随机置乱分组方案对编码密码子序列进行分组,这样,根据编码后的序列和分组方案可以确定一种任意进制的数制系统.最后,利用基于超混沌系统和该数制系统产生随机加密控制信息,并利用该加密控制信息和分组方案来替换对应的编码后序列,从而实现加密.理论分析和实验结果均表明,该文提出的方案和现有的一些方案相比,具有更好的性能.

Encryption Based on DNA Coding,Codon Grouping and Substitution

Traditional encryption schemes are largely based on the two stepsconfusion and diffusion proposed by Shannon. It is proved by experiments that encryption designed on bit level is more efficient. An encryption scheme based on DNA coding, codon grouping and substitution is proposed in this paper, which belongs to bit level encryption. Original media is encoded into pseudo codon sequence with the ideology of DNA coding and central dogma in molecular biology. Then codons are grouped together with a random grouping method. After that, an arbitrary N-nary system is constructed with the pseudo codon sequence and the grouping strategy. Information that controls the substitution of codons is generated with a hyper-chaotic system and the arbitrary N-nary system. Finally, substitution of codons in the pseudo codon sequence is imposed to accomplish the encryption. Both theoretical analysis and experimental results show that the proposed method has much better performance.