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Electronic document copyright protection technology based on digital fingerprint has made great progress in recent years, and also got some practical application, such as the digital fingerprint based on the feature vector of text content, based on the information of user's purchase transaction and based on word frequency statistic, but these digital fingerprints also have some problems that need to be solved. The digital fingerprint generated based on the above methods is complex and cannot verify the integrity of the document correctly, nor does it completely prevent copying. Collusion attack is the most important and difficult problem that digital fingerprint facing now. Based on the problems existing in the previous digital fingerprints, this paper mainly conducts some experimental operations on the time attribute of doc document, and found that doc documents only been added, deleted, modified and saved, and copy to other computers and mobile storage devices, or cut to other locations of the computer, the modification time of the document will change. Based on this time attribute of document, a dual digital fingerprint authentication algorithm based on time attribute is proposed by using SM3 hashing algorithm. First, get the content of document A, the acquired content is hashed using the SM3 hash algorithm to get the hash value 1. Second, acquiring the time property of the document and the SM3 algorithm is used to hash the acquired time attribute, get the hash value 2. Using the two hash values as a double digit fingerprint of a file. It is verified that this dual digital fingerprint can effectively verify the integrity of the document, which is used as the key to control the access to the document, and can prevent the document from being used in the copy circulation between different devices, which is called anti-copy. Introduction With the popularity of the Internet more and more widely, text files in the online dissemination of more and more widespread, companies, public utilities, government departments and other public institutions of the confidential electronic documents and academic research results are random access to steal tampering copy increasingly become the highlighted issues, Therefore, it caused a lot of loss and trouble to companies and individuals. As the representative of the commonly used doc text files are copied tamper with the most serious theft, so this paper proposes a doc document dual digital fingerprint authentication algorithm. [1]The digital fingerprint was first proposed by M. o. rabin, which refers to a method that uniquely maps different text objects to a different text in a very high probability. In order to deal with the natural language plagiarism in various text formats, the digital fingerprint of various texts emerges. [2]Domestic scholar, Jean, etc. [2] A text digital fingerprint algorithm based on text feature is proposed, and the characteristic vector is formed by the word frequency statistic of the literature, then the watermark and key are constructed in the register server according to the feature vector. [2] Shu Juanjuan and this basis, a text watermarking algorithm based on speech frequency is proposed. The above text watermarking algorithm has good robustness to common plagiarism. However, like the MD5 algorithm, the resulting fingerprint is too complex to consider the computational efficiency. Simhash algorithm is essentially a dimensionality reduction technique, a high dimensional eigenvector is mapped to a lower dimensional space to achieve the objective of preserving the feature as much as possible. G S. Manku applies this algorithm to the field of information retrieval and calls it sim-hash. In order to prevent the text from being accessed,

Dual Digital Fingerprint Authentication Algorithm of DOC Document Based on SM3 Algorithm