Patent ID: 8700905
Filing Date: 2014-04-15
Classification: G06F

Abstract:
1. A method comprising: (i) providing a computer apparatus having a first monitor configured to display an electronic document to be signed by a signer, (ii) providing a signature capture apparatus having a second monitor, the signature capture apparatus being an individual unit separate from, but in communication with, the computer apparatus, and being configured to electronically capture a handwritten signature of the signer and biometric data of the signer's signature, (iii) generating in the computer apparatus a first hash sum of the electronic document to be signed, (iv) transmitting to the signature capture apparatus one of: (a) the generated first hash sum and (b) the generated first hash sum and the electronic document to be signed, (v) displaying on the first monitor of the computer apparatus the electronic document to be signed and the first hash sum of the electronic document, (vi) displaying on the second monitor of the signature capture apparatus the first hash sum transmitted from the computer apparatus, (vii) electronically capturing the handwritten signature of the signer made on the signature capture apparatus, thereby generating signature data, (viii) encrypting one of: (a) the signature data and (b) the signature data and the electronic document using the transmitted first hash sum, (ix) generating in the signature capture apparatus a digital signature image of the electronically-captured handwritten signature of the signer, (x) embedding the first hash sum in the generated digital signature image of the electronically-captured handwritten signature of the signer by using a prescribed secret embedding technique, (xi) transmitting to the computer apparatus one of: (a) the encrypted signature data and (b) the encrypted signature data and the encrypted electronic document, (xii) transmitting the digital signature image with the embedded first hash sum to the computer apparatus, (xiii) extracting the embedded first hash sum in the computer apparatus according to said embedding technique, (xiv) checking whether the extracted first hash sum is identical to the first hash sum generated in the computer apparatus, and (xv) if the extracted hash sum is identical to the first hash sum generated in the computer apparatus, performing one of: (a) storing the encrypted signature data and the signed electronic document on a computer-readable medium and (b) forwarding the encrypted signature data and the signed electronic document to a computer-readable medium for storage purposes.