Double authentication-based word document electronic seal system and method

Abstract

The invention discloses a double authentication-based word document electronic seal system and method. The system of the invention comprises a digital signature module, a BMP image-based fragile watermarking module, a word format information carrying-based robust watermarking module and a key management module. A double-authentication mechanism is adopted to realize the authentication of electronic seal; when the fragile watermarking is invalid, the robust watermarking can not only complete the inspection of the document, but also generate a document source analysis report and a tamper detection report to clear the issuer information of the file and the specific tampered position and ensure the integrity, truth, reliability and nonrepudiation of the electronic document. The invention has a perfect electronic seal management system and an identity authentication strategy based on hardware, and can provide further detection function for the tampered document and store the summary information of the document by means of the fragile image watermarking and the robust watermarking. The invention also discloses a double authentication-based word document electronic seal method.

Description

technical field [0001] The invention relates to the technical field of computer information security, in particular to an electronic seal system and an electronic seal method applied to word documents. Background technique [0002] With the rapid development of e-commerce and e-government, and the popularization of office automation, users put forward higher requirements for the security and authenticity of electronic documents. In addition, with the comprehensive popularization of information-based office, electronic seals came into being. [0003] Electronic seals are mainly used to solve the problem of signing and issuing electronic documents, to identify the identity of the signers of electronic documents, and to ensure the integrity, authenticity, reliability and non-repudiation of electronic documents. It can be considered that the emergence and popularization of electronic seals is the last link to realize the entire electronic process of information transmission, an...

AI Technical Summary

Problems solved by technology

[0006] The electronic seal management system of many electronic seal systems is not perfect, or even does not have a seal management system at all. The management of seal holders is chaotic, and there is a phenomenon of multiple seals for one household or one seal for multiple households.

Some electronic seal products do not have a CA interface, and store the user's private key locally, leaving a back door for those who illegally make and use the seal, and cannot guarantee the integrity, usability, authenticity and non-repudiation of electronic documents

[0007] (2) Relying solely on fragile image watermarks to save document summary information

[0008] In the existing electronic seal products, only the abstract information obtained by the digital signature of the document is embedded in the seal image with digital watermarking technology. The design of the watermark information is too simple, and the loading method is single. The contained watermark information, once the seal image is destroyed, the protection function of the electronic seal on the electronic document will disappear

[0009] (3) Lack of hardware-based identity authentication strategy

[0010] In the current network environment, the username / password login method is difficult to meet the security requirements

Some electronic seal products still simply use the user name / password to authenticate users. This unsafe authentication method greatly reduces the security of the electronic seal system. Illegal users can easily obtain fake seals by stealing user login information. , fake document production

[0011] (4) No further detection function is provided for illegally modified documents

[0012] Existing electronic seal products can basically only prompt users whether the electronic document has been modified, and do not provide advanced detection functions, such as tampering degree analysis, tampering location, etc., which greatly reduces the practicability of such electronic seal products

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