Section double encryption and safe loading method of Windows dynamic link library

Abstract

The invention discloses a section double encryption and safe loading method of a Windows dynamic link library and aims at solving the technical problems that dynamic link libraries in prior art are prone to be tracked and debugged, privately loaded by application programs and statically disassembled. The method includes the following steps of analyzing a Windows dynamic link library file structure, establishing a private dynamic link library derived table, clearing away the derived table of the dynamic link library, respectively subjecting a code segment and a data segment of a dynamic link library file to encryption by an encryption key of an assigned encryption algorithm; subjecting the whole dynamic link library file to encryption by another encryption key of the assigned encryption algorithm; and outputting an interface function from the private dynamic link library derived table to an application program during loading.

Description

technical field [0001] The invention relates to information security technology, in particular to an encryption protection and a private loading method for a dynamic link library on a Windows platform. Background technique [0002] In the industry, software product companies often provide the developed Windows software to customers in the form of a dynamic link library (DLL). This is a convenient way to distribute, but there are several possible threats: [0003] 1. Customers can statically analyze the dynamic link library to understand the important algorithms in it; [0004] 2. Customers can track and debug the dynamic link library when the program is running to understand the important algorithms in it and obtain important data at runtime. For example, in the IPTV system, the scrambling key of the streaming media can be obtained by tracking and debugging the terminal program; [0005] 3. After the dynamic link is loaded, according to the start address of the image in t...

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Problems solved by technology

[0009] The purpose of the present invention is to solve technical problems such as being easily tracked and debugged after being encrypted by the dynamic link library in the prior art, being loaded by the application program privately, being disassembled statically, etc., and providing a general Windows dynamic link library encryption protection method and private loading method, which can effectively prevent the dynamic link library from being tracked and debugged, loaded without permission, statically disassembled, etc.

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