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International Association for Cryptologic Research (IACR)
Abstract
Sanitizable signatures are a variant of signatures which allow a single, and signer-defined, sanitizer to modify signed messages in a controlled way without invalidating the respective signature. They turned out to be a versatile primitive, proven by different variants and extensions, e.g., allowing multiple sanitizers or adding
new sanitizers one-by-one. However, existing constructions are very restricted regarding their flexibility in specifying potential sanitizers.
We propose a different and more powerful approach: Instead of using sanitizers\u27 public keys directly,
we assign attributes to them. Sanitizing is then based on policies, i.e., access structures defined over attributes.
A sanitizer can sanitize, if, and only if, it holds a secret key to attributes satisfying the policy associated to a signature,
while offering full-scale accountability
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