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What's the difference between VBB and iO?

fr flag

What's the difference between the definitions of virtual black-box (VBB) obfuscation and indistinguishability obfuscation (iO)? Is there any presentation describing both? Furthermore, why is the notion of iO interesting (and sufficient in practical sense) given that it is a weaker notion than VBB?

us flag
[How to Use Indistinguishability Obfuscation](https://eprint.iacr.org/2013/454) by Sahai & Waters might be a nice place to start, at least to answer your second question. A classic use of VBB is to convert a symmetric-key encryption into a public-key one (the public key is just a VBB obfuscation of the encryption function). The introduction of the Sahai-Waters paper shows a very nice high-level idea of how to convert symmetric-key to public-key encryption, using only iO.
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