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

Claim 20:
21. In a user device capable of being interfaced to an electronic document device and an authentication server to execute an electronic signature, an electronic signature authentication method based on biometric information comprising:
calculating a hash value of an electronic document received from the electronic document device;
generating a handwritten signature for final document confirmation for registering to the authentication server;
calculating a hash value of the handwritten signature for final document confirmation and a hash value of at least one handwritten signature for document confirmation, generating a first electronic signature value for the electronic document by encrypting the hash value of the electronic document received from the electronic document provider with a private key of a signer, generating a second electronic signature value for the handwritten signature for final document confirmation by encrypting the hash value of the handwritten signature for final document confirmation with the private key of the signer, and generating a third electronic signature value by encrypting the hash value of at least one handwritten signature for document confirmation with the private key of the signer; and
generating a first encryption data by encrypting the hash value of the electronic document received from the electronic document device and the first electronic signature value with a public key of the electronic document provider, generating a second encryption data by encrypting the hash value of the electronic document received from the electronic document device and the first electronic signature value with a public key of the authentication server, generating a third encryption data by encrypting the handwritten signature for final document confirmation, the hash value of the handwritten signature for final document confirmation, and the second electronic signature value for the handwritten signature for final document confirmation with the public key of the authentication server, and generating a fourth encryption data by encrypting the at least one handwritten signature for document confirmation, the hash value of the at least one handwritten signature for document confirmation, the third electronic signature value for the at least one handwritten signature with the public key of the authentication server, and transmitting the first through fourth encryption data to the electronic document device.