A Secure Data Sharing Proxy with Accountable Re-Encryption

Proxy re-encryption (PRE) provides a promising result for translated data participating in public pall. When data proprietor Alice is going to partake her translated data with data consumer Bob, Alice generates are-encryption key and sends it to the pall garcon (deputy); by using it, the deputy can transfigure Alice’s cipher textbooks into Bob’s without learning anything about the underpinning plain textbooks. Despite that being PRE schemes can help the deputy from recovering Alice’s secret key by conspiracy attacks with Bob, due to the essential functionality of PRE, it’s ineluctable that the deputy and Bob together are able to gain and distribute Alice’s decryption capabilities. Indeed worse, the vicious deputy can deny that it has blurted the decryption capabilities and has veritably little threat of getting caught. A judge algorithm can decide whether it’s innocent or not. We also present anon-interactive APRE scheme and prove its CPA security and responsibility under DBDH supposition in the standard model. Eventually, we show how to extend it to a CCA secure one.