Fine-Grained and Controllably Redactable Blockchain with Harmful Data Forced Removal

Table 1

Notations.

Notation	Meaning
	A monotone collection
	The attributes’ universe
	A public key encryption scheme
	The security parameter
	The public parameters of
	The public and private key of
	The message
	The ciphertext
	A digital signature scheme
	The public parameters of
	The signer’s public and private key in
	The signature in
	A NP-language
	A noninteractive proof system for
	A common reference string
	The statement
	The corresponding witness
	The proof
	The public parameters of PCH
	The master key pair of PCH
	The set of attributes
	The user’s secret key in PCH
	The hash value
	The randomness
	The modified message
	The new randomness
	The public parameters of P3S
	The master key pair of P3S
	The signer’s key pair in P3S
	The sanitizer’s key pair in P3S
	The description of modification