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Control flow complication-based Java code obfuscation method

A technology of code obfuscation and control flow, applied in the field of computer security, can solve problems such as addition, insufficient utilization of loop structure, software piracy, etc., and achieve the effect of overcoming insufficient utilization and realizing the method of complicating control flow

Active Publication Date: 2017-05-10
STATE GRID JIANGSU ELECTRIC POWER CO ELECTRIC POWER RES INST +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 1. Software piracy, lawbreakers can easily copy software with the same or similar functions as the original software through decompiled source code, or crack software that does not need to be activated
[0004] 2. Tampering or modifying the software source code without changing the function of the software, but adding advertisements or other malicious codes and viruses to it
These methods are mainly used to deal with decompilation, and the loop structure is underutilized

Method used

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  • Control flow complication-based Java code obfuscation method
  • Control flow complication-based Java code obfuscation method
  • Control flow complication-based Java code obfuscation method

Examples

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Embodiment Construction

[0051] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

[0052] Such as figure 1 As shown, a Java code obfuscation method based on control flow complexity includes the following steps:

[0053] Step 1, construct the set of opaque predicates.

[0054] Using the comparison of references in Java to construct opaque predicate sets, the opaque predicate sets include constructing the set T of predicates that are always true and the set F of predicates that are always false.

[0055] Step 2, find the loop structure.

[0056] Discover loop structures from Java code snippets, they should look like this case:

[0057] code show as below:

[0058] B: Cal_A

[0059] If not A go to E;

[0060] C

[0061] Go to B;

[0062] E:

[0063] The specific process...

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Abstract

The invention discloses a control flow complication-based Java code obfuscation method. The method comprises the steps of 1, constructing a non-transparent predicate set; 2, discovering a loop structure; 3, separating the loop structure; 4, inserting the non-transparent predicate set into the separated loop structure; and 5, complicating the loop structure. According to the method, the shortcoming of insufficient utilization of the loop structure in an existing code obfuscation method is overcome and a control flow complication method utilizing the loop structure is realized.

Description

technical field [0001] The invention relates to a Java code obfuscation method based on the complication of control flow, which belongs to the field of computer security. Background technique [0002] With the rise of the mobile Internet, mobile applications are becoming more and more popular. These applications make full use of the computing power and portability of mobile devices and facilitate people's lives. However, there are a large number of Java programs in mobile applications. Java programs are distributed in the form of packaged .class files after compilation. These .class files are all Java bytecodes, and the original Java bytecodes can be decompiled to restore the source code that differs from the original code only in the comments. code. This gives attackers or other criminals an opportunity. The main problems this brings are as follows: [0003] 1. Software piracy, lawbreakers can easily copy software with the same or similar functions as the original softwa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F21/14
CPCG06F21/14
Inventor 周超郭雅娟黄伟朱道华姜海涛郭静李斌王黎明陈锦铭
Owner STATE GRID JIANGSU ELECTRIC POWER CO ELECTRIC POWER RES INST
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