Patent ID: 9036818
Filing Date: 2015-05-19
Classification: H04L

Abstract:
1. A private key generation apparatus, comprising: a root private key generation unit configured to set a root master key and predetermined parameters capable of generating private keys, and to generate a first sub-master key set capable of generating a number of private keys equal to or smaller than a preset limited number; and a sub-private key generation unit configured to share authority to generate private keys with the root private key generation unit by receiving the first sub-master key set from the root private key generation unit, to generate a private key corresponding to a user ID using the first sub-master key set, and to issue the private key to a user; wherein the root private key generation unit receives a sub-private key generation unit ID and information about the number of service users from the sub-private key generation unit, authenticates the sub-private key generation unit ID, and transmits the first sub-master key set to the sub-private key generation unit if the authentication is successful, wherein at least one of the root private key generation unit and the sub-private key generation unit is implemented as a hardware component.