An Efficient Pairing-Free Certificateless Searchable Public Key Encryption for Cloud-Based IIoT

Table 1

Notions for some basic operations.

Symbols	Definition
	Runtime for a scalar multiplication in
	Runtime for a modular multiplication in
	Runtime for a bilinear pairing
	Runtime for a point addition in
	Runtime for a map-to-point hash
	The bit-size of a point in
	The bit-size of a number in
	The bit-size of
	The bit-size of ciphertext
	The bit-size of trapdoor