Improved Lightweight Cloud Storage Auditing Protocol for Shared Medical Data

Table 1

Symbols.

Symbols	Description
	Two multiplicative cyclic groups with a large prime order
	A secure hash function such that
	A secure hash function such that
	A prime field with nonzero elements
	The generator of group
	A shared data file with blocks and slices.
	The blind data block.
	The secret seed (input key) of a pseudo-random function
	A pseudo-random function such that
	The number of random values is consistent with the number of slices of the data block.
	The blinding factor corresponding to the -th data block such that
	’s private key used to generate data authentication label
	The authentication label for the -th blind data block
	The authentication label for the -th data block
	The number of TPM
	The identity of the group manager