Chinese Journal of Network and Information Security ›› 2018, Vol. 4 ›› Issue (4): 56-62.doi: 10.11959/j.issn.2096-109x.2018032

• Papers • Previous Articles     Next Articles

Simple Matrix encryption scheme with variable ciphertext length

Zhong WANG,Yiliang HAN   

  1. Engineering University of PAP,College of Cryptographic Engineering,Xi’an 710086,China
  • Revised:2018-04-01 Online:2018-04-01 Published:2018-05-30
  • Supported by:
    The National Natural Science Foundation of China(61572521)


Multivariable public key cryptography is one of the reliable candidates for anti-quantum cryptography.The Simple Matrix scheme is constructed using the operations between three matrices.An improved version of the Simple Matrix scheme was proposed.It is constructed by using two flat matrices with random quadratic polynomials,so that the rank attacks is infeasible for the new scheme,and the algebraic attacks breaks the system is at least as hard as solving a set of random quadratic equations.The new scheme will improve the proportion of ciphertext and plaintext to 2 times or more,break the fixed proportion of ciphertext and plaintext,so that it has a flexible proportion to adapt to different needs.

Key words: multivariable public key cryptography, Simple Matrix scheme, the proportion of plaintext and ciphertext, security analysis

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