NDLI: Hardware-assisted code obfuscation for FPGA soft microprocessors

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Hardware-assisted code obfuscation for FPGA soft microprocessors

Content Provider	ACM Digital Library
Author	Kainth, Meha Tessier, Russell Krishnan, Lekshmi Virupaksha, Sandesh Gubbi Narayana, Chaitra
Abstract	Soft microprocessors are vital components of many embedded FPGA systems. As the application domain for FPGAs expands, the security of the software used by soft processors increases in importance. Although software confidentiality approaches (e.g. encryption) are effective, code obfuscation is known to be an effective enhancement that further deters code understanding for attackers. The availability of specialization in FPGAs provides a unique opportunity for code obfuscation on a per-application basis with minimal hardware overhead. In this paper we describe a new technique to obfuscate soft microprocessor code which is located outside the FPGA chip in an unprotected area. Our approach provides customizable, data-dependent control flow modification to make it difficult for attackers to easily understand program behavior. The application of the approach to three benchmarks illustrates a control flow cyclomatic complexity increase of about 7X with a modest logic overhead for the soft processor.
Starting Page	127
Ending Page	132
Page Count	6
File Format	PDF
ISBN	9783981537048
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2015-03-09
Publisher Place	San Jose
Access Restriction	Subscribed
Subject Keyword	Soft microprocessor Code obfuscation
Content Type	Text
Resource Type	Article

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