中文摘要：

控制流速惑是代码迷惑的一个重要方面．程序控制流分为过程内控制流及过程间控制流．本文提出了一种基于switch_case语句的控制流迷惑技术；首先给出一种基于switch语句的程序变换方法，使得过程内的控制流关系变得复杂，同时利用switch语句对整个程序中的函数进行重新定义，从而迷惑程序中的函数调用关系，以达到迷惑过程间控制流信息的目的．最后表文定性地分析了这种代码迷惑技术的性能．

英文摘要：

Control Flow Obfuscation is one important aspect of code obfuscation. Programr s control flow can be departed into two parts ： Intra-procedural Control flow and inter-procedural control flow. This article gives out an algorithm of code obfuscation based on switch_case clause. Firstly it gives out a kind of program transformation based on switch clause to make the relation of control flow in a procedure more complex, and at the same time it uses the switch clause to redefine the functions of the whole program so as to obfuscate the function call relations, and the inter-procedural control flow information. Lastly the article implements part of the algorithm and analyze its efficiency .