A Delegation Attack Method on Attribute-Based Signatures and Probable Solutions

Attribute-based signature (ABS) assures the verifier that message is endorsed by a signer whose attributes satisfy claimed attribute policy (predicate); thus, it can provide identity authentication with privacy preservation in scenarios like anonymous communication and access control. However, we have found inherent delegatibility of attribute-based cryptography, which enables utilization relationship between policies, could make most existing ABS constructions not unforgeability requirement under common security model. In this paper, dig into property for first time propose potential delegation attack to break We also give two instances on typical construction demonstrate feasibility proposed attack. Finally, present solutions improve above issue further discussion about ABS.