Invisible office printing text encryption and decryption method

Abstract

According to the invisible office printing text encryption and decryption method provided by the invention, the relatively strong anti-interference capability can be realized, the hardware consumption resource is very few, and the requirement on the text is relatively low. The invention provides a relatively simple and feasible hidden data encryption method, the algorithm is relatively simple, contents such as time, places, figures and unit information can be effectively embedded into the document by performing hidden encryption on the document, and once the document is illegally leaked, the leaked unit or personnel can be quickly and effectively positioned and inquired. The hardware consumption resources are very few; the requirement on the text is less, and information encryption can be realized only by using a small amount of texts or characters; the method is high in anti-interference capability, and the influence of text printing on encryption can be effectively resisted; the concealment is high, the device is not easy to discover, and post query or tracing is facilitated; and the manuscript is free from macroscopic change, thereby facilitating the use and reading of the manuscript.

Description

technical field [0001] The invention relates to the technical field of printing text encryption, in particular to a method for encrypting and decrypting printed text in an invisible office. Background technique [0002] In today's highly developed science and technology, information security has been paid more and more attention by people. In all walks of life, inside or secret information exists. When the information is printed out in the form of manuscripts and distributed to various relevant units or functional departments, how to effectively manage and control the information is an important issue faced by each unit or department. Especially when information is leaked, how to effectively trace and query, and plug the loopholes of information leaks requires very technical means. However, all printing and copying products currently on the market use explicit watermark information to mark manuscripts. Obviously, this cannot completely effectively prevent information leaka...

AI Technical Summary

Problems solved by technology

[0004] Although there are many existing hidden digital encryption technologies, most of them have a common disadvantage: the encrypted information is only effective for high-definition electronic digital images themselves, when disturbed by the outside world, especially when the printer prints out , when the response non-uniformity of the photosensitive material of the toner cartridge itself and the non-uniformity of the toner itself interfere with the original data, the encrypted information is very easy to be destroyed, thus losing the encryption effect

However, due to the use of unimportant pixel bits of the image, the robustness of the algorithm is poor, and the watermark information is easily destroyed by filtering, image quantization, and geometric deformation operations.

However, using the data encryption technology based on DCT transformation, although under certain conditions, the anti-interference ability has been improved to a certain extent, but its disadvantages are 1) a large amount of calculation and a huge consumption of hardware resources; 2) the image and The complexity of the document has certain requirements, that is, the texture of the image should be relatively rich, because this technology mainly changes the frequency domain of the image, and encrypts the data of the high-frequency, medium-frequency, and low-frequency parts

But obviously, when the document or image information is less, the converted spectrum is relatively single, and data encryption cannot be effectively carried out

At the same time, it is also susceptible to interference

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