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Design and Implementation of Method Generation based Watermarking Technique for Android Copyright Protection

안드로이드 저작권 보호를 위한 메소드 생성 기반 워터마킹 기법의 설계 및 구현

  • Park, Heewan (Department of Information Communication and Software, Halla University)
  • 박희완 (한라대학교 정보통신소프트웨어학과)
  • Received : 2018.10.29
  • Accepted : 2019.01.20
  • Published : 2019.01.28

Abstract

As smartphones become widespread, numerous applications are developed and social issues related to software copyright are emerging. Software watermarking is digital watermarking technology applied to software and is a technology that can be used to recognize copyright owners. Generally, Java language is used to develop applications on the Android environment. The Java is an object-oriented language that supports method overloading and overriding. In this paper, we propose and implement a method generation based watermarking technique. As a result of evaluating the overhead due to the watermark, it was confirmed that the increase of the executable file size and the decrease of the execution speed are not large. Using the watermarking technique proposed in this paper, it is expected that copyright information can be verified when illegal copying is suspected or actual program is stolen, and piracy attempts will be prevented in advance.

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Fig. 1. Kim-gisa and T-map copyright dispute[5]

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Fig. 2. Cymera and Analog Filter copyright dispute[7]

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Fig. 4. Example of the method overloading

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Fig. 5. Example before method overloading

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Fig. 6. Example after method overloading

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Fig. 7. Example of the method overriding

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Fig. 8. Example before method overriding

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Fig. 9. Example after method overriding

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Fig. 10. Method overloading example before adding opaque predicate

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Fig. 11. Method overloading example after adding opaque predicates

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Fig. 12. Method overriding example before adding opaque predicate

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Fig. 13. Method overriding example after adding opaque predicates

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Fig. 14. Structure of watermarking system

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Fig. 15. Changes of source and apk file size according to method overloading numbers

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Fig. 16. Changes of source and apk file size according to method overriding numbers

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Fig. 17. Runtime overheads according to opaque predicate numbers

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Fig. 3. (a) Original source and (b) Modified source with copyright information

Table 1. Example of opaque predicates

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Table 2. Changes of source and apk file size according to method overloading numbers

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Table 3. Changes of source and apk file size according to method overriding numbers

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Table 4. Runtime overheads according to opaque predicate numbers

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Acknowledgement

Supported by : 한라대학교

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