Security and Communication Networks

Research Article

Ldasip: A Lightweight Dynamic Audit Approach for Sensitive Information Protection in Cloud Storage

Table 3

Qualitative analysis of the calculation cost of this scheme and existing schemes.


scheme	Signature generation stage	Challenge response phase	Verification phase	Dynamic operation phase

[9]	nHash_G + nMul_G+2Exp_G	(c-1)Mul_G + cExp_G + cMul_z∗q+(c-2) add_z∗q	(c+2)Exp_G + cHash_G+(c+1)Mul_G + Hash_z∗q+6Pair	Not supported

[10]	nHash_G+3nMul_G+(s+3)nExp_G	(c-1)Mul_G + cExp_G + cMul_z∗q+(c-1) add_z∗q	(3c + cs+1)Exp_G + nHash_G+(5c + sc-1)Mul_G+(2c+1)Pair	Not supported

Ldasip	(n+2)Hash_G + nMul_G+(2n+2)Exp_G + nHash_z∗q	(c-1)Mul_G + cExp_G + cMul_z∗q+(c-1) add_z∗q	(c+2)Exp_G+(c+2)Hash_G + cMul_G+ Hash_z∗q+6Pair	4Exp_G+7Hash_G + Mul_G+4Pair + Hash_z∗q

Note. n represents the number of divided blocks of the file, s represents the number of sectors divided by each data block, and c represents the number of data blocks challenged by the auditor.