A Complement to Enhanced Instruction Register File against Embedded Software Falsification

Fujieda, Naoki; Sato, Kiyohiro; Ichikawa, Shûichi

doi:10.1145/2843859.2843864

Cited by 1 publication

(2 citation statements)

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“…These results imply that the addition of the positional register causes 10% decrease of system performance if the processor operates at the maximum possible frequency and the peripheral devices work at a proportional frequency to the processor's. We had already shown that the critical path of the Plasma processor included the decode stage [3], [17]. As the recovery of the original instruction with the positional register is done in the decode stage, it directly affected the critical path.…”

Section: Results Of Fpga Implementationmentioning

confidence: 99%

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Evaluation of Register Number Abstraction for Enhanced Instruction Register Files

Fujieda

Sato

Iwamoto

et al. 2018

IEICE Trans. Inf. & Syst.

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Instruction set randomization (ISR) is a cost-effective obfuscation technique that modifies or enhances the relationship between instructions and machine languages. An Instruction Register File (IRF), a list of frequently used instructions, can be used for ISR by providing the way of indirect access to them. This study examines the IRF that integrates a positional register, which was proposed as a supplementary unit of the IRF, for the sake of tamper resistance. According to our evaluation, with a new design for the contents of the positional register, the measure of tamper resistance was increased by 8.2% at a maximum, which corresponds to a 32.2% increase in the size of the IRF. The number of logic elements increased by the addition of the positional register was 3.5% of its baseline processor.

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Section: Results Of Fpga Implementationmentioning

confidence: 99%

“…This problem can be solved by forcing IRF-resident instructions to be executed only by the corresponding special instructions. We have proposed a complementary unit, called IRRF (Instruction Rejection Register File) to achieve it [17].…”

Section: Instruction Register Filementioning

confidence: 99%