Attribute-Based Server-Aided Verfication Signature

Attribute based signature (ABS) is a novel cryptographic primitive, which enables a party can sign messages for any predicate satisfy by their attributes. However, heavy computational cost is required during the verification procedure in most existing ABS schemes, which may needs many pairing operations. Pairing are costly operation when compared to exponentiation in the base group. As a result, this presents a greatly challenge for resource-limited users, such as smart cards and wireless sensor. In other words, verification can hardly be done in these devices if attribute based signature is employed. We solve this problem by proposing a new notion called Attribute-Based Server-Aided Verification Signature. It is similar to normal ABS scheme, but it further enables the verifier to verify the signature with the assistance of an external server. In this paper, we provide the security definition of AttributeBased Server-Aided Verification Signature, and design a concrete serveraided verification protocol for Li et al.’s attribute based signature. We also prove that our protocol is secure with random oracles.