Security

On the Power of Rewinding Simulators in Functional Encryption

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Executive Summary

In the recent years, Functional Encryption (FE) has received a lot of attention due to its versatility and unique challenges it poses. In FE, a receiver with secret-key sky can compute from an encryption of x the value F(y; x) for some functionality F. The seminal work of boneh, sahai and waters [TCC'11] showed that for functional encryption the in-distinguishability notion of security (IND-Security) is weaker then simulation-based and, moreover, showed that simulation-based security is impossible to achieve even in weaker settings.

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