KATU128 is a compact, efficient cryptographic permutation designed for lightweight authenticated encryption and hashing in constrained environments. It emphasizes low gate count, small memory footprint, and competitive security margins for 128-bit security targets.
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Suppose alphabet starts with A = 0, B = 1, etc.
Input: "Hi" (hex 48 69)
Bits: 01001000 01101001
7-bit groups: 0100100 (36), 0011010 (26), 0100000 (32 — padded)
Encoded: chars at indices 36, 26, 32 → ? (depends on alphabet). KATU128 — Targeted Brief
What is KATU128
Katu 128: A Comprehensive Guide