Resource-match the OMA reference in the key-length sweep (oma_ser_keylen), which gives it the L/16 combining gain the longer frame allows. The proposal now passes a resource-matched OMA by 1.27x at L=64 rather than the 4.3x reported against a fixed-d reference. Densify the JSR, sensitivity, and brute-force grids so the curves are smooth, give the index cipher its channel floor instead of error-free reception, and add the permutation-key known-plaintext attack (exp_permkpa) so Fig. 7 carries a conventional linear scheme. Add check_cov_attack.py and check_cov_ceiling.py: a referee raised a ciphertext-only second-order attack; the exact-population test shows the received covariance leaks only a sparse rank-deficient subset of the key Gram and leaves the eavesdropper at the random-guess level. Dump verify_math.csv, move the superseded V=256 pilot CSVs to data/pilot.
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| 1 | L | d | legit_ser | eve_ser | mask_xcorr |
|---|---|---|---|---|---|
| 2 | 8 | 16 | 0.5546 | 0.9975366667 | 0.07264538854 |
| 3 | 16 | 32 | 0.1181416667 | 0.99724 | 0.006702715065 |
| 4 | 32 | 64 | 0.09873416667 | 0.9943241667 | 0.01185981557 |
| 5 | 64 | 128 | 0.08845333333 | 0.9922383333 | 0.009370678104 |
| 6 | 128 | 256 | 0.08771083333 | 0.9851966667 | 0.008488235064 |