IACR News item: 22 July 2025
Zachary A Kissel
A redactable set signature scheme is a signature scheme that allows a redactor, without possessing the signing key, to convert a signature on set $S$ to a signature on set $S'$ if $S' \subset S$. This paper introduces a new form of redactable set signature scheme called a policy-based redactable set signature scheme. These redactable set signatures allow for a signer to provide a redaction policy at signing time that limits the possible redactions that can be made by a redactor. In particular, a signature on set $S$ can only be redacted to a signature on $S'$ if $S' \subset S$ and $P\left(S'\right) = 1$.
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