As the recent improvement in information technology, the role of software becomes more and more important in computing environments. Software is generally released as a form of binary information, such as instructions and data for executing programs. Although such software is protected by software licenses, it may be analyzed or reverse-engineered to employ in developing other software without permission. Code obfuscation is an approach to making original code harder to analyze or understand by

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... transforming its original code into different form with preserving semantics or execution results. Code obfuscation is helpful to protect against reverse engineering of software. In this paper, we introduce several approaches to obfuscating program code to make software harder to analyze or understand. We introduce measures for evaluating code obfuscation and compare the performance of each code obfuscation methods according to the measures. Index Terms-Code obfuscation, program transformation, binary code analysis, software protection. Hyun-Il Lim received his BS, MS and PhD degrees in computer science from KAIST,