Unlinkable Policy-based Sanitizable Signatures

ePrint Report: Unlinkable Policy-based Sanitizable Signatures

Ismail Afia, Riham AlTawy

In CT-RSA 2020, P3S was proposed as the first policy-based sanitizable signature scheme which allows the signer to designate future message sanitizers by defining an access policy relative to their attributes rather than their keys. However, since P3S utilizes a policy-based chameleon hash (PCH), it does not achieve unlinkability which is a required notion in privacy-preserving applications. Moreover, P3S requires running a procedure to share the secret trapdoor information for …

eprint report policy signatures