A Lightweight Identity-Based Cloud Storage Auditing Supporting Proxy Update and Workload-Based Payment

Table 1

Notations.

Notation	Meaning
	Multiplicative cyclic groups with prime order p
	Two generators of group
	A bilinear pairing map
	A cryptographic hash function,
	A cryptographic hash function,
	The security parameter
	The master private key
	The user identity
	The proxy identity
	The cloud identity
	The user ’s private key
	The proxy ’s partial private key
	The cloud ’s private key
	The warrant
	The warrant’s start time and end time
	The time private key
	The proxy private key
	The file
	The number of data blocks of file F
	The i-th block of file F
	The signature of data block
	The signature set of data blocks
	The upload number
	The linear combination of data blocks
	An aggregated data signature