Scrambling and obfuscating method for Lua language and decryption method

Abstract

The present invention discloses a scrambling and obfuscating method for the Lua language and a decryption method. The scrambling and obfuscating method for the Lua language comprises: using a code preprocessing method, an obfuscating method and a call stack conversion method to perform lexical analysis on code and establish a data dictionary, wherein word sequences are combined into grammar phrases so as to obtain an abstract syntax tree; performing primary obfuscation by using a minimum vocabulary ranking method; and performing high-level obfuscation by using a control flow obfuscating method, so that the obfuscated Lua source code cannot be understood while a semantic meaning is not changed, so as to achieve an objective that program code is protected without affecting normal execution of the program. During decryption, the Lua source program code is read, and the source code is reversed according to a correspondence stored in the data dictionary, so as to acquire decrypted Lua code, i.e, the Lua source program code before scrambling and obfuscating. According to the scrambling and obfuscating method and the decryption method provided by the present invention, copyright protection can be effectively performed on a Lua source program, and the reverse or tampering of the Lua source program can be prevented.

Description

technical field [0001] The invention relates to a program scrambling and obfuscation method, in particular to a Lua language-oriented scrambling and obfuscation method and a decryption method. Background technique [0002] With the increasing popularity of computer technology and the rapid development of the software industry, at the same time, there are more and more attacks, unauthorized use and pirated copies of software by attackers using software reverse technology. Reverse analysis technology can be used to analyze the functional flow of the application program, tamper with the data code of the application program, etc. without knowing the source code of the application program. If the reverse analysis technology is used maliciously without restriction, the user can analyze and obtain the application program. The core technology of the program can also tamper with the signature and author information of the application, and can also inject malicious code into the exist...

AI Technical Summary

Problems solved by technology

[0006] CullenLinn studied the object code obfuscation technology from another angle in "Obfuscation of executable code to improve resistance to static Disassembly". Through the analysis of the disassembly process, an obfuscation method can hinder reverse engineering, making it very difficult to obtain the assembly instructions of the program or to obtain the assembly of the program correctly. instruction

[0007] To sum up, most of the existing scrambling and obfuscation methods are for C language and Java language, and lack of mature obfuscation methods for Lua language

Images