Proposal of Dynamic Algorithms Combining a Substitution Layer and a Key Addition Layer for Block Ciphers using SHA3-256

Tóm tắt

In recent years, one research direction that has
garnered significant attention from scientists is enhancing the
security of SPN block ciphers against strong cryptanalysis
attacks through dynamic methods. Researchers have focused
on proposing dynamic implementations of substitution layers,
diffusion layers, and key addition layers, as well as combi
nations of these layers. These proposals are often based on
mathematical foundations such as chaotic mappings, DNA
techniques, affine transformations, or specially structured
MDS matrices, among others. However, none of these studies
have utilized the mathematical foundation of hash functions or
combined substitution and key addition layers, nor have they
leveraged the results of these layers as dynamic parameters for
other layers. Therefore, in this study, we propose two dynamic
algorithms that combine the key addition layer and substitu
tion layer using the cryptographic hash function SHA3-256.
Additionally, the dynamic method for the substitution layer is
implemented using parameters derived from the key addition
layer. We use the proposed dynamic algorithms to dynamically
modify the AES block cipher while evaluating the security
and randomness standards of the dynamic AES block cipher.
With the two proposed dynamic algorithms, not only is there
no increase in the expanded key size, but the security of the
modified dynamic AES algorithm can also be significantly
enhanced to 288