A Privacy-Preserving Identity Authentication Scheme Based on the Blockchain

Table 2

Parameter definitions.

Symbol	Description	Size
	Bit length of an element in G	512
	Bit length of an identity	256
	Bit length of a timestamp	32
	Bit length of a random number	256
	Bit length of a hash function	256
	Bit length of a signature	1024
	Bit length of a proof	1024