Threshold Attribute-Based Signature and Its Security
Zhou Chang · Dianzi xuebao · 2013
A threshold attribute-based signature(t-ABS) scheme defines each signer with a set of attributes,which determine signature ability for each signer.In a t-ABS,signature holder prove possession of signatures by revealing only a threshold number of attributes in common with the verification attribute set,hence providing signer-attribute privacy for the signers.In this paper,we analyze a flexiblethreshold ABS proposed by Li et al and demonstrate its vulnerability to forgeable attacks.Finally,we introduce a t-ABS scheme,which is proved to be secure in the standard model based on CDH problem.