A novel chaos-based partial image encryption scheme using Lifting Wavelet Transform

Depending on applications and specific security requirements, digital images can either be fully or partially encrypted. Partial encryption is one of the methods that reduces computational and processing cost. To achieve partial encryption, chaotic maps in combination with different transforms, like the Wavelet Transform (WT), Discrete Cosine Transform (DCT) and Lifting Wavelet Transform (LWT) are often used. Due to higher efficiency and fast processing, LWT is preferred over wavelet transform. In this paper, a novel partial image encryption scheme based on LWT, Secure Hash Algorithm (SHA-512), Logistic-sine chaotic map, TD-ERCS chaotic map and Substitution Box (S-Box) is presented. In comparison to other schemes, the proposed encryption technique is computationally efficient, secure and sensitive to initial key conditions