Government documents ciphering and deciphering method

Abstract

The invention relates to a method for encrypting and decoding files, including the procedures as follows: the message of an incoming text unit is coded, the only binary code is distributed for every incoming unit; the message code of the incoming text unit is embedded into the file, those units of files are needed to be transmitted, a character or a symbol is picked out in the file, and the character or the symbol is moved upward or downward for certain distance according to a corresponding unit message code; the file is distributed to complete the encryption after printed; the segmentation processing on a scanned image of the distributed files and the original file is carried out respectively, corresponding position of other splitting characters and first characters is calculated in the line; according to the calculated corresponding position between the characters, the different value between the corresponding positions of the scanned image of the distributed files and the scanned image of the original file is compared; all coding characters are identified to gain the related coded unit message of the incoming text unit, completing the decoding. The invention can effectively encrypt the message of the incoming text unit, thus providing a method for identifying a person who releases the file in transmission.

Description

technical field [0001] The invention belongs to a file encryption and decryption method. Specifically, it uses the idea of ​​digital watermarking for reference, and adds numbering information to the file to identify the file distributed to different places without affecting the display appearance of the official document. Background technique [0002] At present, when the government issues official documents, it generally needs to issue the same approval document to many departments or localities, and only the issued department or locality is allowed to know it. It should not be copied and forwarded to any other third party, especially some political documents. more demanding. If the documents are forwarded to a third party, important policies or even state secrets may be leaked, and even these official documents bearing the official seal of the government may be used to engage in improper work, with disastrous consequences. Therefore, in order to ensure that the relevant r...

AI Technical Summary

Problems solved by technology

However, in this method, the font characteristics of the text in the official document are relatively obvious, and the difference between the distributed official document and the original official document can be distinguished by human eyes, and the confidentiality needs to be improved.

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