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US 5,606,609 AGranted
Electronic document verification system and method
AssigneeScientific-Atlanta, Inc.
InventorsPeter B. Houser, James M. Adler
Life of this patent
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AssigneeScientific-Atlanta, Inc.
InventorsPeter B. Houser, James M. Adler
Estimating the term…
The integrity or the signator of an electronic document can be verified by embedding a security object, for example, supported by an object linking and embedding (OLE) capability, in the electronic document at a location selected by the signator. The embedded security object includes security information and an identifier for invoking the processing of the security information. The security information may include a document digest that characterizes the electronic document at the time the security object was embedded, a signature digest that identifies the signator and that characterizes the instance of the embedded security object, and the signator's electronic chop, which may be the signator's digitized signature or other graphic image. In addition, the security information can be encrypted using either private key encryption or public key encryption. When the electronic document is later displayed, the identifier invokes processing that decrypts the security information and calculates the document digest based on the current state of the electronic document. The signator of the electronic document can be verified based upon the result of the decryption. The integrity of the electronic document can be verified if the decrypted document digest matches the calculated document digest. If the signator and the document integrity are confirmed, the electronic chop is displayed in the document. If, however, the signator or document integrity are not verified, the electronic chop is not displayed. In addition, a warning message may be displayed if verification fails.
An apparatus for embedding select information in an electronic document, comprising:
An embedded object interpreter for verification of an electronic document, comprising:
An electronic document verification system, comprising:
An electronic document verification method for verifying the integrity of an electronic document having an object embedded therein, the embedded object including a document digest, said document digest including a data item indicative of the content of the electronic document at the time that the embedded object was embedded and chop graphics information associated with a party that caused the embedded object to be embedded in the electronic document, said electronic verification method comprising the steps of:
An electronic document verification system, comprising:
A verification system comprising:
Dependencies are inferred from the claim text.