Lightweight image encryption algorithm using NLFSR and CBC mode.

The digital images are widely captured, transmitted, and stored by limited resource devices. Those devices need lightweight encryption (LWE) techniques to protect secret and personal images. Designing LWE algorithms for digital images is challenging due to the large size and high inter-pixel correlations of digital images. This paper presents an image encryption technique based on the Nonlinear feedback shift register (NLFSR) and DNA computation. The image is permuted first using pseudorandom sequence generated by a NLSFR based Key stream generator followed by a substitution of pixel values using DNA computations in cipher block chaining mode. Furthermore, security analysis tests, histograms, correlation, entropy, NPCR, and UACI are used to verify our scheme. The security and performance analysis of the proposed techniques analyses showed their efficacy and resistance to attacks. The analysis of the results certainly indicates the scheme is highly secure and lightweight. The proposed scheme can be used for secure image transmission and storage in medical IoT, smart surveillance, etc. [ABSTRACT FROM AUTHOR]