Security and Communication Networks

Research Article

A Privacy-Preserving Data Transmission Scheme Based on Oblivious Transfer and Blockchain Technology in the Smart Healthcare

Table 2

Computational cost comparison.


Entities	Registration phase	Encryption phase	Data access phase	phase

KGC		—	—	—
Client	—
Blockchain	—
Servers	—	—

: XOR operation; : Weil operation; : hash operation; : power operation in ; and : power operation in . : the number of doctors registered; : the number of patients registered; : the number of patient ciphertexts; : the number of servers; : the number of .