Beschreibung:
This work proposes a new deterministic entropy source that is adequately pseudorandom for the design of substitution boxes (s-box) for image encryption applications. The source is a novel multistable chaotic system with a far-reaching ergodicity space that shows high sensitivity to both states and parametric deviations. The series of numbers generated from the source sufficiently pass the various tests for randomness and pseudorandomness as recommended by the National Institute of Standards and Technology. S-boxes are generated based on data from the system and are subjected to further cryptographic analyses, including nonlinearity, strict avalanche criterion, bit independence criterion, equiprobable xor-logic, and security. Specifically, the security analysis tests the robustness of the generated s-boxes on image encryption and decryption based on the cipher block chaining mode. Although each mode implements the so-called data encryption standard, using the proposed entropy source for the generation of s-boxes, initialization vectors, and permutation and resizing tables, the method holds the potential to heighten confusion and diffusion in the ciphertexts as indicated by various Pearson's correlations coefficients. Relevant algorithms are elaborated, and tables of data and graphs of simulations are presented to validate the results