Secure Symmetric Keyword Search with Keyword Privacy for Cloud Storage Services

Table 5

Comparison of security and performance between our scheme and the others.

Scheme	Functionalities			Performances
	CTInd	KeywordInd	Class	Size (CT)	Size (trap)	Comp (test)
Shen et al. [20]	Satisfied	Satisfied	Predicate			+
Blundo et al. [12]	Satisfied	Satisfied	Predicate			2 + 2e +
Proposed scheme	Satisfied	Satisfied	Searchable

CTInd: ciphertext indistinguishability; KeywordInd: keyword indistinguishability; Size (CT): size of PEKS (dPEKS) ciphertext; Size (trap): size of trapdoor (dTrapdoor); Comp (test): computation cost of test (dTest); : element in ; : pairings; : exponentials; : decryption corresponding to .