Computing new certificate for digitized version of a physical document
AssigneeEnt. Services Development Corporation LP
InventorsStuart Haber, Prasad V. Rao
Life of this patent
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Abstract
In one implementation, a physical version of a document is converted to a digital representation of the physical version and a new certificate is computed for the digital representation of the physical version. The new certificate is computed based on the digital representation of the physical version, at least one processing step performed on the digital representation, and a prior certificate computed for a prior digital representation indicative of the physical version. In another implementation, a document is validated.
Claims20
A method comprising:
- converting a physical version of a document to a digital representation of the physical version;
- and
- computing, by a system comprising a hardware processor, a new certificate for the digital representation of the physical version based on combining at least the digital representation of the physical version, a prior digital representation of the physical version, a representation of an invocation of at least one operation performed to transform a different version of the document to the digital representation, and a prior certificate computed for the prior digital representation of the physical version.
A method of validating a document, comprising:
- obtaining a version identifier from a digitized version of a physical document;
- retrieving information items used previously to compute a time stamp certificate for the digitized version of the physical document, the retrieved information items including a representation of an invocation of at least one operation performed to transform a different version of the physical document to the digitized version, and a prior certificate computed for a prior digitized version of the physical document;
- and
- validating the digitized version of the physical document based at least on the retrieved information items and a scanned-in image of the physical document.
A non-transitory storage medium storing machine-readable instructions that when executed cause a system comprising a hardware processor to:
- receive a digital representation of a physical version of a document;
- and
- compute a new certificate for the digital representation of the physical version based on the digital representation of the physical version, a representation of an invocation of at least one operation performed to transform a different version of the document to the digital representation, and a prior certificate computed for a prior digital representation indicative of the physical version, wherein computing the new certificate comprises:
- forming a value by combining at least the digital representation of the physical version, the representation of the invocation of the at least one operation, and the prior certificate;
- and
- computing a hash value using a hash function applied on the value.
Dependencies are inferred from the claim text.