Active weighted threshold signatures support dynamic changes to signer weights, thresholds, and committee membership. We show that local validity of weighted update operations is not a compositional security abstraction: a sequence of individually valid updates can move an initially sub-threshold coalition into an authorized reachable state. We introduce rank-exposure guards, a compiler that enforces a reconstruction-safety invariant over live, stale, derivative, public, and transient signing material. The compiler wraps ledger-sound one-step update engines with atomic activation and old-epoch digest-bound transition certificates, lifting fixed-state weighted unforgeability and update soundness to sequence-level active unforgeability. We instantiate the compiler as REG-ADAPT, a guarded GLI reconfiguration scheme built around ADAPT-style local updates, and implement it on top of the public ADAPT Go artifact. Our evaluation shows that the artifact detects and rejects unsafe update sequences, while adding only microsecond-scale metadata and rank-audit overhead.
BibTeX
@misc{cryptoeprint:2026/1013,
author = {Sunghyeon Jo},
title = {Sequence-Level Security for Active Weighted Signature Reconfiguration},
howpublished = {Cryptology {ePrint} Archive, Paper 2026/1013},
year = {2026},
url = {https://eprint.iacr.org/2026/1013}
}
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