Identity-based proxy re-signature (IDPRS) enables a semi-trusted proxy to convert one user’s signature to another user’s for the
same message without revealing any secret information of both users’ signing keys. In IDPRS, user revocation is a necessary
problem arising from privilege expiry or private key compromise. A revoked user cannot produce new signatures including resignatures from the proxy. There is a need for some applications like a contract management system to keep expired message
and signature pairs valid in the next period. The conventional solution is to require the unrevoked users to sign these messages
again, which burdens users heavily. Therefore, establishing an IDPRS system with revocation and efficient signature updating is
crucial. This paper introduces the concept of revocable IDPRS with signature evolution, facilitating efficient signature updating.
The signature evolution enables the proxy to batch update non-revoked users’ signatures from old ones to new ones, while also
offering precise execution of signature updates on specific messages. Moreover, to further protect the privacy of signature validity,
we employ designated verifier in our scheme. Formal security proofs are provided, and performance evaluation demonstrates our
scheme’s lower computation costs for signature updating and its comprehensive security attributes.
