Authors:
Desam Vamsi,Anupama Namburu,DOI NO:
https://doi.org/10.26782/jmcms.2026.03.00003Keywords:
Fuzzy Logic,SPN Cryptography,IND-CPA Security,Avalanche Effect,Conditional Entropy,Abstract
This research introduces an innovative text encryption method based on fuzzy logic, featuring per-session key generation using Ks = HMAC- SHA256(Km, N || session_id), non-deterministic character substitution, and six rounds of Substitution-Permutation Network processing on 8-character blocks. The design eliminates positional leakage through cross-block diffusion and secret-dependent transformations while providing provable IND-CPA security with adversary advantage bounded by 2???. Extensive testing confirms 49.7% ± 1.2% avalanche effect, conditional entropy H(C|P) = 3.91 bits/character (91% of theoretical 4.32 maximum), and 17.3?s encryption time for 8-byte blocks on standard computing platforms.Refference:
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