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A digital signature and digital signature technology, applied in the field of information security, can solve problems such as troublesome, low security, and inability to verify whether the bitmap has been changed
Active Publication Date: 2011-08-24
FEITIAN TECHNOLOGIES
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Although it can also verify whether the text information has been tampered with, it cannot verify whether the bitmap has been changed, which brings unnecessary trouble and loss to real users, and the security is not high
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Embodiment 1
[0131] figure 1 , is a schematic block diagram of a digital signature system A provided by the present invention, specifically comprising: a digital signature generation device 1, a digital signature verification device 2;
[0132] Digital signature generation device 1, used to complete the digital signature operation process;
[0133] The digital signature generation device 1 specifically includes: an information acquisition module 101 , a first generation module 102 , a watermark embedding module 103 , a management module 104 , a second generation module 105 , an information sending module 106 and an output module 107 .
[0134] An information acquisition module 101, configured to acquire user key information, where the user key information includes user public key information and user private key information;
[0135] The first generation module 102 specifically includes: a first information acquisition unit 201-1, a first signature unit 101-2;
[0136] The first informa...
Embodiment 2
[0217] Figure 4 , is a schematic block diagram of the second digital signature system B provided by the present invention, specifically comprising: a digital signature generation device 5, a digital signature verification device 6;
[0218] Digital signature generation device 5, used to complete the digital signature operation process;
[0219] The digital signature generation device 5 specifically includes: an information acquisition module 501, a first generation module 502, a watermark embedding module 503, a management module 504, a second generation module 505, an information sending module 506, and an output module 507;
[0220] Information acquisition module 501: used to acquire user key information, the user key information includes user public key information and user private key information;
[0221] The first generation module 502 specifically includes: a first information acquisition unit 502-1, a first signature unit 502-2;
[0222] The first information obtain...
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Abstract
The invention provides a digital signing method which comprises the following steps: acquiring the secret key information of a user; carrying out signing operation on plaintext information so as to generate a digital signature; changing the digital signature by using a watermark algorithm so as to form watermark information with the digital signature; acquiring a bitmap; processing the watermark information and the bitmap and carrying out signing on the bitmap so as to generate a bitmap signature; sending the digital signing information and the public key information of the user; showing the icon of the digital signature; acquiring the digital signing information and the public key information of the user; and verifying the bitmap signature and the digital signature; reporting the verification results of the bitmap signature and the digital signature; and verifying the effectiveness of the digital signature. The invention also provides a digital signing system. In the invention, through respectively carrying out signing on the plaintext information and the bitmap, the safety of a document is ensured; and through respectively verifying the bitmap signature and the digital signature, the authenticity of the document is ensured, and a tamper-proof effect is achieved.
Description
technical field [0001] The invention relates to the field of information security, in particular to a digital signature method and system. Background technique [0002] There are various security problems in paper documents or electronic documents in the prior art, such as being easy to be tampered with, and the signatures of paper documents are easy to be stolen. Since the content of electronic documents is easily changed, and deliberate or unintentional sabotage by others, There are various security risks in paper documents or electronic documents. In the existing document technology, paper documents that are easy to be tampered with have been made into electronic documents, and electronic signature technology is widely used for protection, which greatly increases the security of paper documents and electronic documents. [0003] Electronic signatures generally refer to all electronic documents that exist in electronic form, are attached to electronic documents and are lo...
Claims
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Application Information
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