1. A method comprising: receiving at a signing device an electronic document provided by a source device; preventing alterations to the electronic document presented to a user using the signing device; identifying a signature document including a digital image embedded with a digital watermark, wherein the digital watermark is an image that represents a watermark and overlays at a least a portion of the digital image and embeds in the signature document, independent of any private key of a user, a one-way hash calculated using the electronic document; in connection with presenting the signature document including the watermark image applied to the digital image, receiving an electronic handwritten signature from the user; altering an appearance of at least the digital image based, at least in part, on the electronic handwritten signature; associating the electronic document with the altered signature document as a signed electronic document; and transmitting the signed electronic document for verification, wherein the signed electronic document is verified by at least comparing the embedded one-way hash to a one-way hash computed from the electronic document during verification.
1. A method comprising: receiving at a signing device an electronic document provided by a source device; preventing alterations to the electronic document presented to a user using the signing device; identifying a signature document including a digital image embedded with a digital watermark, wherein the digital watermark is an image that represents a watermark and overlays at a least a portion of the digital image and embeds in the signature document, independent of any private key of a user, a one-way hash calculated using the electronic document; in connection with presenting the signature document including the watermark image applied to the digital image, receiving an electronic handwritten signature from the user; altering an appearance of at least the digital image based, at least in part, on the electronic handwritten signature; associating the electronic document with the altered signature document as a signed electronic document; and transmitting the signed electronic document for verification, wherein the signed electronic document is verified by at least comparing the embedded one-way hash to a one-way hash computed from the electronic document during verification. 6. The method of claim 1 , further comprising encrypting the embedded one-way hash, and wherein embedding a digital watermark representing the embedded one-way hash in an arbitrary digital representation comprises embedding a digital watermark representing the encrypted one-way hash.