Validation stamps for electronic signatures
First Claim
1. A validation stamp for protecting the integrity of an electronic signature on a document, wherein said document includes a body and a document signature, said document signature including geometric information corresponding to said electronic signature, said validation stamp comprising:
- a validation signature including timing information corresponding to said electronic signature for ensuring that said electronic signature is a valid signature; and
a validation body identical to at least a portion of said document body for determining whether said electronic signature was originally intended for said document.
5 Assignments
0 Petitions
Accused Products
Abstract
The present invention describes a validation stamp for protecting the integrity of a signature affixed to an electronic document. The validation stamp of the present invention includes a validation body and a validation signature. The validation stamp is affixed to a signed document having a document body and a document signature. The document signature and the validation signature are derived from an electronic signature defined by geometric and timing information. Specifically, the validation signature includes the timing information, and possibly the geometric information, of the electronic signature, whereas the document signature includes the geometric information, and not the timing information, of the electronic signature. To verify the integrity of the signature on the electronic document, the validation signature is first decrypted and then compared, along with the document signature, against the signed document and geometric and timing information of a signature known for the authorized signator of the electronic document.
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Citations
34 Claims
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1. A validation stamp for protecting the integrity of an electronic signature on a document, wherein said document includes a body and a document signature, said document signature including geometric information corresponding to said electronic signature, said validation stamp comprising:
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a validation signature including timing information corresponding to said electronic signature for ensuring that said electronic signature is a valid signature; and a validation body identical to at least a portion of said document body for determining whether said electronic signature was originally intended for said document. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for protecting an electronic signature affixed to an electronic document comprising the steps of:
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creating a signed document having a document body and a document signature; and assembling a validation stamp for said signed document, wherein said validation stamp includes a validation signature and a validation body. - View Dependent Claims (13, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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14. A method for protecting an electronic signature affixed to an electronic document comprising the steps of:
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creating an electronic signed document having a document body and a document signature; and assembling an electronic validation stamp for said signed document, wherein said validation stamp includes a validation signature and a validation body, said validation body corresponding to at least a portion of said signed document. - View Dependent Claims (15, 16, 17)
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29. A method for verifying the integrity of an electronic signature on an electronic document having a signed document and an encrypted validation stamp, said method comprising the steps of:
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decrypting said validation stamp; and comparing said validation stamp being decrypted against said signed document to determine whether said electronic signature was originally intended by an authorized signator to be affixed to said electronic document wherein said signed document includes a document body and said validation stamp includes a validation body, and wherein said step of comparing said validation stamp includes; comparing said validation body against said document body to determine whether said validation body coincides with said document body.
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30. A method for verifying the integrity of an electronic signature on an electronic document having a signed document and an encrypted validation stamp, said method comprising the steps of:
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decrypting said validation stamp; comparing said validation stamp being decrypted against said signed document to determine whether said electronic signature was originally intended by an authorized signator to be affixed to said electronic document, wherein said signed document includes said document signature and said validation stamp includes a validation signature; and
,comparing timing information of said validation signature and geometric information of said document signature against geometric information and timing information of a signature known for an authorized signator to determine whether said electronic signature is a valid signature.
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31. A method for verifying the integrity of an electronic signature on an electronic document having a signed document and an encrypted validation stamp, said method comprising the steps of:
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decrypting said validation stamp; comparing said validation stamp being decrypted against said signed document to determine whether said electronic signature was originally intended by an authorized signator to be affixed to said electronic document, wherein said validation stamp includes a validation signature; and
,comparing geometric information and timing information of said validation signature against geometric information and timing information of a signature known for an authorized signator to determine whether said electronic signature is a valid signature.
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32. A method for verifying the integrity of an electronic signature on an electronic document having a signed document and an encrypted validation signature, said method comprising the steps of:
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decrypting said validation signature; and comparing said validation signature being decrypted against timing information of a signature known for an authorized signator of said signed document to determine whether said validation signature is a valid signature. - View Dependent Claims (33, 34)
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Specification