Research on power information encryption algorithm based on composite chaotic system in wavelet transform domain

To meet the secret communication requirement of important power information in smart grid, this paper proposed a new power information encryption algorithm based on composite chaos wavelet and transform theory. The algorithm constructs the composite chaotic system using two one-dimensional chaotic mapping which has good sensitivity to initial condition, good pseudo randomness, independence. Time-frequency transformation is carried out on plaintext based on wavelet transform theory, and the wavelet coefficients of plaintext are encrypted using composite chaotic block sequences in wavelet transform domain, under adaptive encryption mechanism with correlation coefficient as the threshold function, thus improving the security and confidentiality of cipher information. Numerical simulation encryption experiments results show that the algorithm is feasible and effective for power information encryption, with excellent cryptography characteristics and strong practical significance. (C) 2011 Published by Elsevier Ltd. Selection and/or peer-review under responsibility of [CEIS 2011]