Image encryption using block cipher and chaotic sequences

Encryption of data with high correlation, such as images, is a challenge for block ciphers, since patterns of the original image may remain after encryption. This is due to the deterministic mapping performed by the cipher. To overcome this limitation, a block cipher is used in an adequate mode of operation, such as cipher block chaining, counter mode. It is presented in this work randomized block ciphers inspired by the Rijndael architecture employing chaotic maps as an entropy source. It is shown that the proposal achieves good security and robustness indicators with fewer rounds compared to that obtained with the Rijndael algorithm. •Propose randomized block ciphers inspired by the Rijndael architecture employing chaotic maps as an entropy source.•Encrypt images using the randomized version of the Rijndael S-box.•Propose alternatives to the diffusion layer of the Rijndael that speed up the encryption process.•Analyze the level of security of the proposed ciphers.