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

Abstract

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.