Traceable Multiauthority Attribute-Based Encryption with Outsourced Decryption and Hidden Policy for CIoT

Table 2

Notations.

Notation	Meaning
	The universe set of attribute authorities
	The set of corrupted attribute authorities
	The set of attribute authorities related to the user GID
	The universe set of attributes
	An attribute authority
	The attribute set controlled by
	The global identity of a user
	The attribute set related with user
	The public parameter
	Secret key related to
	Public key related to
	Message
	The LSSS access matrix and its row label function
	Access control structure
	The attribute set related with
	The ciphertext
	The secret key of user
	The outsourced decryption key ()