Patent ID: 9705683
Date: 2017-07-11
CPC Classifications: H04L

Claim:
1. A method of generating an implicit digital certificate for use in a public key cryptosystem, said method comprising: combining session public keys of two electronic entities to generate public key reconstruction data for one of the electronic entities; combining the public key reconstruction data with an identity of said one of the electronic entities and encrypting the combination to generate a first digital certificate component; generating a second digital certificate component by using the first digital certificate component as an input corresponding to a message in a digital signature scheme, and generating a digital signature on the message, said first digital certificate component and said second digital certificate component constituting an implicit digital certificate for the one electronic entity, whereby an ephemeral private key is derivable for the one of the electronic entities using one of the first and second digital certificate components in a manner that permits the corresponding ephemeral public key to be derived from the remaining certificate component; and sending at least one of the implicit digital certificate components over a communication link to be used in subsequent communications in the public key cryptosystem.