Method for recogniting seal by digital watermark

A digital watermarking and digital signature technology, applied in digital transmission systems, electrical components, transmission systems, etc., can solve problems such as loss of legal norms, inability to implement rights and obligations, and difficulty in determining the identity of actors, and achieve fidelity guarantees , good fidelity effect
CN1758585AInactive Publication Date: 2006-04-12北京华旗数码影像技术研究院有限责任公司 +1
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
北京华旗数码影像技术研究院有限责任公司
Publication Date
2006-04-12
Estimated Expiration
Not applicable · inactive patent

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Abstract

A certification and seal method of digital watermark includes inserting process as calculating out file control abstract value by using digital abstract algorithm of SHA, SHA ¿C 1, MD5 and CRC16 / 32, embedding said abstract value in digital certification seal image and inserting it in electronic file; verifying process as calculating out file content abstract value by using relevant digital abstract algorithm, picking up hidden file content abstract from digital seal image in file and comparing two abstract values for obtaining verification result.
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Description

technical field

[0001] The invention relates to using computer software to embed digital authentication signatures in various electronic documents such as Word, Excel, PDF, images, graphics, and CAD design drawings, so as to realize the functions of preventing tampering, anti-counterfeiting, fidelity and authentication. The "digital watermark" in the "method for digital watermark authentication and signature" of the present invention is a data hiding technology. The size of the image before and after embedding data is the same, and the difference between the image before and after embedding cannot be distinguished by the naked eye. "Certification seal" represents the function of the invention, which means that the invention inserts a signature image into the electronic document to realize the certification function of the document. Background technique

[0002] In the network environment, the transfer of files takes electronic means, such as E-mail. The biggest advantage of...

Claims

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