Obfuscation of design intent in object-oriented applications

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Obfuscation of design intent in object-oriented applications (2003)

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by Mikhail Sosonkin , Gleb Naumovich , Nasir Memon

Venue:	In DRM ’03: Proceedings of the 3rd ACM workshop on Digital rights management
Citations:	16 - 0 self

BibTeX

@INPROCEEDINGS{Sosonkin03obfuscationof,
    author = {Mikhail Sosonkin and Gleb Naumovich and Nasir Memon},
    title = {Obfuscation of design intent in object-oriented applications},
    booktitle = {In DRM ’03: Proceedings of the 3rd ACM workshop on Digital rights management},
    year = {2003},
    pages = {142--153},
    publisher = {ACM Press}
}

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Abstract

Protection of digital data from unauthorized access is of paramount importance. In the past several years, much research has concentrated on protecting data from the standpoint of confidentiality, integrity and availability. Software is a form of data with unique properties and its protection poses unique challenges. First, software can be reverse engineered, which may result in stolen intellectual property. Second, software can be altered with the intent of performing operations this software must not be allowed to perform. With commercial software increasingly distributed in forms from which source code can be easily extracted, such as Java bytecodes, reverse engineering has become easier than ever. Obfuscation techniques have been proposed to impede illegal reverse engineers. Obfuscations are program transformations that preserve the program functionality while obscuring the code, thereby protecting the program against reverse engineering. Unfortunately, the existing obfuscation techniques are limited to obscuring variable names, transformations of local control flow, and obscuring expressions using variables of primitive types. In this paper, we propose obfuscations of design of object-oriented programs. We describe three techniques for obfuscation of program design. The class coalescing obfuscation replaces several classes with a single class. The class splitting obfuscation replaces a single class with multiple classes, each responsible for a part of the functionality of the original class. The type hiding obfuscation uses the mechanism of interfaces in Java to obscure the types of objects manipulated by the program. We show the results of our initial experiments with a prototype implementation of these techniques.

Keyphrases

design intent object-oriented application obfuscation technique single class reverse engineering unauthorized access stolen intellectual property initial experiment original class unique challenge illegal reverse engineer program design past several year digital data java bytecodes much research prototype implementation variable name source code primitive type program functionality object-oriented program program transformation unique property local control flow type hiding obfuscation paramount importance obfuscation replaces several class multiple class commercial software

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