SEMDA: Secure and Efficient Multidimensional Data Aggregation in Smart Grid without a Trusted Third Party

Table 1

Notations in SEMDA scheme.

Notation	Description
	Smart meters
	Fog node
	Control center
	Fine-grained user data
	The encoded plaintext message value
	Key signed by the user
	User authenticated key
	User and FN identity
	Ciphertext after FN aggregation
	Plaintext after CC decryption
	The private key to encrypt
	User blind factor
	User’s key set
	Current time and time slot
	Signatures of user and FN
	CC’s private key
	Large prime selected by Chinese remainder theorem