Block Ciphers Substitution Box Generation Based on Natural Randomness in Underwater Acoustics and Knights Tour Chain. (arXiv:2205.13593v1 [cs.CR])

The protection of confidential information is a global issue and block
encryption algorithms are the most reliable option. The famous information
theorist, Claude Shannon has given two desirable characteristics that should
exist in a strong cipher which are substitution and permutation in their
fundamental research on Communication Theory of Secrecy Systems. block ciphers
strictly follow the substitution and permutation principle to generate a
ciphertext. The actual strength of the block ciphers against several attacks is
entirely based on its substitution …

block box ciphers