An SKP-ABE Scheme for Secure and Efficient Data Sharing in Cloud Environments

Table 1

Comparison of KP-ABE schemes.

KP-ABE scheme	Ciphertext search	Key escrow problem	Ciphertext size
Yin et al. scheme [7]	Provided	Possible to occur	Proportional to the number of attributes
Ameri et al. scheme [8]		Not considered (possible to occur)
Li et al. scheme [9]
Meng et al. scheme [10]			Constant-size ciphertext
Longo et al. scheme [13]	Not provided	Key escrow problem solved (multi authority)
Leyou Zhang et al. scheme [14]		Key escrow problem solved (decentralized authority)	Proportional to the number of attributes
Kai Zhang et al. scheme [30]		Not considered (possible to occur)	Constant-size ciphertext
Belguith et al. scheme [31]
Goal of the proposal scheme	Provided (fast ciphertext search)	Key escrow problem solved (single authority)	Constant-size ciphertext