A Multiuser Ciphertext Search Scheme Based on Blockchain and SGX

Table 1

Notations and descriptions.

Notations	Descriptions
(PKo, SKo)	Public/secret key pair of A
(PKu, SKu)	Public/secret key pair of B
(PKsgx, SKsgx)	Public/secret key pair of Enclave
K	Symmetric encryption key of A
M	A plaintext data collection
C	A ciphertext data collection
H	A ciphertext data hash collection
Set	The outsourced collection
CT	The data authorization request
Tr	The Trapdoor