Patent ID: 8392716
Filing Date: 2013-03-05
Classification: H04L

Abstract:
1. A digital signature issuance method for issuing, in a digital signature issuance apparatus, a digital signature to a second apparatus which communicates with a first apparatus, comprising the steps of: receiving a parameter from the first apparatus; computing data, based on the parameter received from the first apparatus, for use by the second apparatus to share secret data for encryption with the first apparatus; issuing a result of the computation to the second apparatus; receiving, from the second apparatus, data which is calculated by the second apparatus based on the shared secret data; generating a digital signature, using a private key, for both an address of the second apparatus and the data which is calculated by the second apparatus based on the shared secret data, wherein the digital signature is generated using the private key so as to be usable by the first apparatus for authentication based on the shared secret data and the address of the second apparatus used to share the secret data; and