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POPL 2019
Sun 13 - Sat 19 January 2019 Cascais, Portugal
Mon 14 Jan 2019 14:30 - 15:00 at Sala XII - Research Papers: Program Verification Chair(s): Chris Hawblitzel

The insertion of expressions mixing arithmetic operators and bitwise boolean operators is a widespread protection of sensitive data in source programs. This recent advanced obfuscation technique is one of the less studied among program obfuscations even if it is commonly found in binary code. In this paper, we formally verify in Coq this data obfuscation. It operates over a generic notion of mixed boolean-arithmetic expressions and on properties of bitwise operators operating over machine integers. Our obfuscation performs two kinds of program transformations: rewriting of expressions and insertion of modular inverses. To facilitate its proof of correctness, we define boolean semantic tables, a data structure inspired from truth tables. Our obfuscation is integrated into the CompCert formally verified compiler where it operates over Clight programs. The automatic extraction of our program obfuscator into OCaml yields a program with competitive results.

Mon 14 Jan
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14:00 - 15:30: CPP 2019 - Research Papers: Program Verification at Sala XII
Chair(s): Chris HawblitzelMicrosoft Research
CPP-201914:00 - 14:30
Research paper
Ian RoessleVirginia Tech, USA, Freek VerbeekOpen University of the Netherlands, The Netherlands, Binoy RavindranVirginia Tech
CPP-201914:30 - 15:00
Research paper
Sandrine BlazyUniv Rennes- IRISA, Rémi HutinIRISA / ENS Rennes
CPP-201915:00 - 15:30
Research paper
Nicolas Koh, Yao LiUniversity of Pennsylvania, Yishuai LiUniversity of Pennsylvania, Li-yao XiaUniversity of Pennsylvania, Lennart BeringerPrinceton University, Wolf Honore, William ManskyUniversity of Illinois at Chicago, Benjamin C. PierceUniversity of Pennsylvania, Steve ZdancewicUniversity of Pennsylvania