change_point

Mode: unknown_key  ·  File: algorithms/unknown_key/change_point.py

CUSUM (cumulative-sum) over the entropy profile. Detects stable high-entropy plateaus — the classic signature of packed key material surrounded by structure.

Parameters (read from context.extra)

Key	Default
window	32
step	16
entropy_threshold	4.5
cusum_threshold	0.8
drift	0.05
plateau_widths	[32, 48]

Output

Match.label = "cusum_plateau_{N}B". Typically fed into constraint_validator downstream.