Signed ciphertext feedback, lags 1-25
Signed ciphertext-feedback (autokey-family) keys with lags 1-25, applied directly. Executed: 800 target evaluations. Run in the private cryptolab standing campaign dot-standing-006 (verdict NULL_WITHIN_DIRECT_FEEDBACK_SCOPE_UNATTESTED, 0 survivors); RESULTS.md sha256 964b32519b4e. Evidence is held with SHA-256 manifests and is available from the owner on request.
In plain English: Tests signed ciphertext-feedback (autokey-family) keys with lags 1-25, applied directly, with the known plaintext at its carved positions. Every setting in scope was tested, and none was consistent with the 24 known plaintext letters.
This record is negative within the tested scope.
ELIMINATED
Tier 2
How to read this record
- Verdict – ELIMINATED (ruled out within the tested scope), NOISE (nothing beyond what chance produces for a search of this size; also shown when a record stored no verdict of its own), INCONCLUSIVE (the test left candidates or options standing, or could not decide, so it does not rule the method out), INTERESTING (slightly above random, almost certainly coincidence), SIGNAL (statistically unusual, warrants investigation), or FULL MATCH (all 24 known letters correct).
- Confidence Tier – Tier 1 = mathematical proof, valid while its stated assumptions hold. Tier 2 = every possibility within the stated scope tested. Tier 3 = partially tested or sampled. Tier 4 = not yet properly tested.
- Configs Tested – How many different key/parameter combinations were tried.
- Best Score – How many of the 24 known plaintext letters the best attempt matched (out of 24). N/A means no such score could be read from this record.
- Keystream Consistency (Bean) – Whether the key values at different positions are mathematically consistent with each other. The check only holds when the known letters stay in their carved positions (no letters rearranged or removed), and the full set used here assumes the standard A to Z alphabet.
- Scope Limitations – What this elimination does not rule out.
- Configs Tested
- 800
- Best Score
- N/A
- Confidence
- Tier 2: Exhaustive search under stated assumptions. Does not eliminate multi-layer variants.
- Date Tested
- 2026-10-05
Scope Limitations
This elimination does not rule out:
- Settings outside the ranges named above
- Arrangements in which the known plaintext is not at its carved positions
Assumptions
- The cribs EASTNORTHEAST and BERLINCLOCK sit at their carved positions (1-based 22-34 and 64-74)
- The cipher model named above applies directly to the 97 carved letters
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