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

Inactive 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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Problems solved by technology

We can also look at it from a legal point of view, because in the network environment, the identity of the actor is difficul...

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  • Method for recogniting seal by digital watermark
  • Method for recogniting seal by digital watermark
  • Method for recogniting seal by digital watermark

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Embodiment Construction

[0034] The present invention will be further described in detail below in conjunction with the accompanying drawings, please refer to the accompanying drawings. figure 1 The operation of embedding a digital signature in the network can be divided into 4 steps, and the operation of verifying a digital signature can be regarded as the opposite 4 steps.

[0035]The operation steps of embedding a digital signature are as follows: First, read the internal code of the document content to obtain the content of the electronic document that needs to be protected; second, in order to provide the content digest value embedded in the digital signature, it is necessary to pass the digital digest algorithm, To obtain the content abstract value of the content internal code of the electronic document, the digital abstract algorithm we choose here is the MD5 algorithm; in the third step, in order to obtain the binary image of the signature, the content abstract value needs to be embedded in the...

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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.

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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Application Information

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IPC IPC(8): H04L9/00
Inventor 田新刘曼
Owner 北京华旗数码影像技术研究院有限责任公司
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