Encryption method and device for font library

Abstract

The invention relates to an encryption method and an encryption device for a font library in the field of character information processing. The font library comprises internal code information and dot matrix information. The encryption method comprises the following steps of: performing distributed computing on the internal code information with a first key to generate a secondary key; encrypting the dot matrix information with the secondary key to generate dot matrix data cipher text information; and encrypting the dot matrix data cipher text information or the combination of the internal code information and the dot matrix data cipher text information with the secondary key to generate a verification code. The encryption method and the encryption device for the font library provided by the embodiment of the invention have the advantages of preventing illegal users from replacing the font library and thus effectively improving the confidentiality of the font library.

Description

technical field [0001] The invention relates to the field of character information processing, in particular to a font encryption method and device. Background technique [0002] In the prior art, some devices, such as USB security devices with display functions, embedded systems, etc., need to store fonts of characters to be displayed in the device in advance. The font library records the internal code information and dot matrix information of all supported display characters, the internal code information records the binary code corresponding to the character; the dot matrix information records the character at each corresponding point of the display device The displayed color and brightness correspond one-to-one to the internal code information and dot matrix information. When the application device wants to display a certain character, the application program first searches for the internal code information of the character, and then obtains the dot matrix information c...

AI Technical Summary

Problems solved by technology

[0003] At present, in these applications, the fonts are stored in plain text without any security measures. Illegal users can easily change the fonts by tampering with the internal code information or dot matrix information, or directly replace the fonts, and change the content displayed on the application device. , thus misleading users, which can easily lead to the leakage of user private information and cause security risks

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