  The information security has an irreplaceable position in the smart grid
(SG). In order to avoid the malicious attack and ensure the information
security, the cryptographic techniques are essential. This paper focuses on the
encryption techniques to ensure the information security of SG. Firstly, an
unusual 7-dimensional complex chaotic system (7D-CCS) combined with the cubic
memristor is introduced. Besides its phase portraits, Lyapunov exponent, 0-1
test, complexity, and bifurcation diagram are investigated. Then, with the
proposed 7D-CCS, we design a data encryption algorithm to ensure the encryption
security. Finally, the data and monitoring images in SG are encrypted by the
designed encryption scheme. Besides, the encryption performance is given in
detailed. The experimental results show that the proposed encryption scheme has
quite good encryption performance. Therefore, it can ensure the information
security of SG.
