Secure Outsourced Attribute-Based Signatures with Perfect Anonymity in the Standard Model

Table 1

Previous schemes.

Scheme	Chen et al. [16]	Mo et al. [17]	Sun et al. [19]	Huang et al. [20]	Liu et al. [21]	Ren and Jiang [22]	Cui et al. [24]	Hu et al. [25]
Access structure	Threshold	LSSS	Threshold	Circuit	Threshold	Threshold	Threshold	LSSS
Type	SP	KP	SP	KP	SP	SP	SP	KP

LSSS = Linear Secret Sharing Scheme, SP = signature-policy, KP = key-policy.