AB_SAC: Attribute-Based Access Control Model Supporting Anonymous Access for Smart Cities

Table 1

Solution comparison.

Literature	Feature	Anonymous access	Fine-grained AC	Policy flexibility	Audit	Restricted object type
[11]	Attribute certificate, k-times anonymity	Y	Y	N	N	N
[10]	Hierarchical CP-ABE, delegation	Y	Y	N	N	Y
[12]	CP-ABE, proxy re-encryption	Y	Y	N	N	Y
[4]	Attribute certificate	Y	Y	N	Y	N
[5]	Attribute certificate, hierarchical structure	Y	N	N	Y	N
[6]	CP-ABPRE	Y	Y	N	N	Y
ABSAC	Nonunique identifier	Y	Y	Y	Y	N