Method and device for electronically capturing a handwritten signature using embedding technique
First Claim
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.
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Accused Products
Abstract
A method and apparatus for encrypting an electronic document involves a computer having a first monitor and a signature capture apparatus configured to capture a handwritten signature on a second monitor. A hash sum of the electronic document generated in the computer is transmitted to the signature capture apparatus. The electronic document and the first hash sum thereof are displayed on the first monitor. The first hash sum is also displayed on the second monitor. After electronically capturing the handwritten signature, the signature data are encrypted using the first hash sum. A digital signature image is generated in the signature capture apparatus and the first hash sum is embedded therein. The embedded first hash sum is then extracted in the computer. If the extracted hash sum is identical to the first hash sum generated in the computer apparatus, the encrypted signature data and the signed document are stored.
46 Citations
26 Claims
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1. A method comprising:
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(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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 24)
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18. A signature system, comprising:
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a) a computer apparatus having; a storage device configured to store at least an electronic document to be signed, a first data processing device configured to generate a first hash sum of the electronic document to be signed by the signer, to extract the first hash sum embedded in a received digital image of the signature of a signer according to a prescribed secret embedding technique, and to check whether the extracted first hash sum is identical to the first hash sum generated in the computer apparatus, a first monitor configured to display the electronic document to be signed and the first hash sum of the electronic document to be signed, a first input/output interface electrically connected with a separate signature capture apparatus and configured to transmit at least the first hash sum of the electronic document to be signed to the signature capture apparatus and to receive data from the signature capture apparatus, and b) the signature capture apparatus, which is a unit separate from, but in communication with, the computer apparatus via the first input/output interface, the signature capture apparatus having; a signature capture window configured to capture a signature made thereon and to capture biometric data of the signer'"'"'s signature, a second monitor configured to display the first hash sum transmitted from the computer apparatus, a second data processing device configured to encrypt the captured signature data using the first hash sum transmitted from the computer apparatus, to generate in the signature capture apparatus a digital signature image of the captured handwritten signature of the signer, and to embed the first hash sum transmitted from the computer apparatus in the generated digital signature image of the captured handwritten signature of the signer by using said embedding technique, a second input/output interface electronically connected to the second monitor and the second data processing device and configured to transmit to the computer apparatus one of;
(i) the encrypted signature data, (ii) the encrypted signature data and the first hash sum and (iii) the encrypted signature data, the first hash sum and the digital signature image with the embedded first hash sum. - View Dependent Claims (19, 20, 21, 22, 23)
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25. A signature capture apparatus configured to be used in combination with a computer apparatus of a signature system, the signature capture apparatus being a separate unit configured to electronically communicate with the computer apparatus and comprising:
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a signature capture window configured to capture a handwritten signature made thereon by a signer and biometric data of the handwritten signature, a display device configured to display a first hash sum of an electronic document to be signed by the signer, the first hash sum being received from the computer apparatus, a data processing device configured to encrypt the captured signature data using the first hash sum received from the computer apparatus to generate in the signature capture apparatus a digital signature image of the captured handwritten signature, and to embed the first hash sum received from the computer apparatus in the generated digital signature image of the captured handwritten signature of the signer by using a prescribed secret embedding technique, and an input/output interface electronically connected to the display device and the second data processing device and configured to transmit the encrypted signature data and the digital signature image with the embedded first hash sum to the computer apparatus. - View Dependent Claims (26)
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Specification