Informatica

In this paper, we present an enhanced version of a previously published symmetric block cipher implemented for the encryption of digital images. We introduce an additional step of using Arnold’s cat map prior to encryption to improve its quality. After inspecting the statistical characteristics of the ciphertexts for the electronic codebook (ECB) and cipher block chaining (CBC) modes, we found that with this additional step, our schemes produce high entropy ciphertexts for both regular and monochromatic images. Therefore, the results obtained in this paper show that our schemes are indifferent to the Advanced Encryption Standard (AES) cipher. Moreover, due to an effective parallelization of matrix operations, we think that our proposal can be executed reasonably fast.