Revocable key identity based cryptography without key Escrow problem

摘要

Key Generation Centre (KGC), a third party in Identity Based encryption (IBE) assumed trustworthy, is responsible for generating Master Keys for the user. A KGC misusing its power can be disastrous. So, there exists a single vulnerable point in Identity Based Encryption (IBE), often known as Key Escrow problem. In this paper, an Identity Based scheme for encryption is proposed which aims to remove inherent Key Escrow Problem of IBE systems described by Boneh and Franklin. Also, the scheme proposed in this paper includes a mechanism for key revocation for non-revoked users.