Patent ID: 8370632

Claim:
A digital signature method comprising: at a time when the digital signature incorporation device is coupled to the host device as a peripheral device via a host-peripheral interface, operating the digital signature incorporation device to: a. receive an electronic document into the digital signature incorporation device from the host device via the host-peripheral interface; b. display the electronic document of the received data object on a display screen of the digital signature incorporation device; c. in response to a user application of an electronic handwriting signature to the document using an electronic pen at a time when the electronic document is displayed on the display screen, modify an appearance of the displayed electronic document on the display screen to reflect visual changes to the electronic document of the applied electronic handwriting signature; d. subject, to a PKI encryption, a hash of an electronic representation of the document as visually modified by the application of the electronic handwriting signature to the electronic document by the electronic pen; e. subject, to a PKI encryption, recorded biometric data generated by movement of the user's hand while applying the electronic signature; and f. send, from the digital signature incorporation device to the host device via the host-peripheral interface an output file comprising: i) a graphical description of the original electronic document and the visual changes to the electronic document of the applied electronic handwriting signature; ii) the PKI-encrypted biometric data; and iii) the PKI-encrypted hash.