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"IO" is an acronym for "Indistinguishability obfuscation". Informally, obfuscating a program is the process of concealing what the program is doing while at the same time preserving its functionality. Among other things this serves to protect against code tampering and reverse engineering.

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How inefficient are current Indistinguishability Obfuscation (IO) candidates?

Since last year, IO finally seems to be within our reach. … Let's say we want to obfuscate some Boolean circuit $C$ of size $n$, what's the magnitude of $|iO(C)|$ in Landau notation (if we take $n$ to be the security parameter)? …