Certificateless Broadcast Proxy Re-encryption With Group-Oriented Model
Chih‐Hung Wang, Pei-Jyun Lu · International Journal of Computer and Communication Engineering · 2016
The major concept of certificateless cryptosystem is to remove the certificate in public-key cryptosystem and solve the key escrow drawback in the ID-based scheme.For the privacy protection in the public cloud environment, the proxy re-encryption scheme was developed to allow a semi-trusted proxy to transform a ciphertext under one person's public key into other ciphertext under another person's public key without decryption.Nowadays, many related applications of certificateless proxy re-encryption scheme have been proposed.However, most of certificateless proxy re-encryption schemes allow only a single receiver, which means for more receivers, re-transforming the ciphertext multiple times is needed.This paper introduces a novel notion of proxy re-encryption in which the sender can broadcast the re-encrypted ciphertext to a group of receivers through the proxy's assistance based on certificateless public key cryptography.The proposed scheme has the property of constant-size re-encryption key and ciphertext, and is particularly suitable for the application executing in the enormous cloud networking.