Patent ID: 11917074
Assignee: SECUVE CO., LTD.
Field: Digital communication (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 22:
23. In an electronic document device capable of being interfaced to a user device of a signer and an authentication server, an electronic signature authentication method based on biometric information comprising:
transmitting an electronic document to be signed to the user device;
receiving, from the user device, a first encryption data generated by encrypting the hash value of the electronic document received by the user device and the first electronic signature value for the electronic document with a public key of an electronic document provider, a second encryption data generated by encrypting the hash value of the electronic document received by the user device and the first electronic signature value for the electronic document with a public key of the authentication server, a third encryption data generated by encrypting the handwritten signature for final document confirmation, a hash value of the handwritten signature for final document confirmation, the second electronic signature value for the handwritten signature for final document confirmation with the public key of the authentication server, and a fourth encryption data generated by encrypting the at least one handwritten signature for document confirmation inserted into the electronic document, the hash value of the at least one handwritten signature for document confirmation, and a third electronic signature value for the handwritten signature for document confirmation with the public key of the authentication server;
generating a fourth electronic signature value by encrypting the hash value calculated by the electronic document provider for the electronic document with the private key of the electronic document provider and generating a fifth encryption data by encrypting the hash value calculated by the electronic document provider for the electronic document and the fourth electronic signature value with the public key of the authentication server; and
combining the second through fourth encryption received from the user device along with the fifth encryption data to the electronic document to generate a final electronic file for storage,
wherein the first through third electronic signature values are generated by using the private key based on the biometric information of the signer.