Threshold Delegation Scheme Based on Multi-Proxy Re-Encryption
Youjin Jenna Song · International Journal of Security and Its Applications · 2016
Proxy re-encryption (PRE) is a re-encryption technique to enable decryption of information encrypted with a delegator's public key by using the delegatee's private key.In existing PRE systems, there are restrictions to prevent delegation, delegatee, and proxy collusion.Therefore, a system to adjust the delegated decryption privilege using multiproxy is required.This study defines a multi-proxy re-encryption technique based on quorum-controlled asymmetric PRE combined with a proxy that exceeds a threshold.Security weakness against collusion between proxy and delegatee can be prvented by applying such a technique, and re-encryption control by multi-proxy becomes possible.