Sweep every registry function as a substitution box and rank them against the published S-boxes.
f into an 8×8 S-box by the
keyed construction - a byte from the low mantissa bits of f(z) along a
low-discrepancy disk path, filled by first occurrence - and score the five S-box criteria
(nonlinearity, SAC, BIC, differential & linear probability) with a harness validated
against AES (NL 112, DP 0.0156). The leaderboard ranks the whole registry; the explorer
below shows each S-box, its criteria vs AES / the
DCT paper / Skipjack, and its avalanche, differential and
linear structure (no image is encrypted - an S-box is a byte→byte substitution, exactly as in the DCT paper).
Asha’s five Ma–Minda candidates (★; f = z·exp ∫(φ−1)/t)
are flagged throughout. The pure-geometry “direct” rank-order is cryptographically weak and not shown.
The cryptographic fingerprint of the substitution itself - the same quantities the leaderboard scores. No image is encrypted: an S-box is a byte→byte substitution, and these are its avalanche, differential and linear profiles (as analysed in the DCT paper).