Registration and Private Key Distribution Protocol Based on IBE

This paper is to solve the problems of the new users´ registration to PKG (Private Key Generator) and how PKG distribute private keys to the new users safely. After the research of current IBC system, we propose a solution to deal with the problems. We subjoin a user´ private master key using authentication message, by which users can validate the registration information and use IBE to encrypt some message send in the process of key agreement to make sure the message will not be falsified. We prove the protocol proposed in this paper can prevent form KCI (Key Compromise Impersonation) and KRA (Key replicating Attack).