Patent ID: 9071445
Filing Date: 2015-06-30
Classification: H04L

Abstract:
1. In a communication system comprising at least a certification authority computer of a certification authority, a sender computer of a sender and a recipient computer of a recipient, the certification authority computer, the sender computer and the recipient computer communicating with each other over a communication network, a computer-implemented method of transmitting messages encrypted with identity-based public keys derived from information provided by the certification authority, said certification authority having a pair of public and private keys, said method comprising: the recipient computer providing a recipient's registration request to the certification authority computer over the communication network, said registration request correlating to a first secret value selected by the recipient computer; upon receiving a request from the sender computer, said request from the sender computer including an identity information of the recipient selected by the sender, the certification authority computer generating a public key reconstruction data from said registration request, said identity information selected by the sender, a second secret value selected by the certification authority computer and a certificate information selected by the certification authority computer; the certification authority computer transmitting an implicit certificate to the sender computer over the communication network, said implicit certificate including said public key reconstruction data and said certificate information;