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Program hardening for secure execution in remote untrusted environment is an important yet elusive goal of security, with numerous attempts and efforts of the research community to produce secure solutions. Obfuscation is the prevailing practical technique employed to tackle this issue. Unfortunately, no provably secure obfuscation techniques currently exist. Moreover, Barak et. al., showed that not all programs can be obfuscated. Theoretical research exhibits provably secure albeit inefficient constructions, e.g. using tools from encrypted domain.
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