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Due to its hereditary nature, genomic data is not only linked to its ownerbut to that of close relatives as well. As a result, its sensitivity does notreally degrade over time; in fact, the relevance of a genomic sequence islikely to be longer than the security provided by encryption. This prompts theneed for specialized techniques providing long-term security for genomic data,yet the only available tool for this purpose is GenoGuard (Huang et al., 2015).By relying on Honey Encryption, GenoGuard is secure against an adversary thatcan brute force all possible keys; i.e., whenever an attacker tries to decryptusing an incorrect password, she will obtain an incorrect but plausible lookingdecoy sequence.  In this paper, we set to analyze the real-world security guarantees providedby GenoGuard; specifically, assess how much more information does access to aciphertext encrypted using GenoGuard yield, compared to one that was not.Overall, we find that, if the adversary has access to side information in theform of partial information from the target sequence, the use of GenoGuard doesappreciably increase her power in determining the rest of the sequence. We showthat, in the case of a sequence encrypted using an easily guessable(low-entropy) password, the adversary is able to rule out most decoy sequences,and obtain the target sequence with just 2.5\% of it available as sideinformation. In the case of a harder-to-guess (high-entropy) password, we showthat the adversary still obtains, on average, better accuracy in guessing therest of the target sequences than using state-of-the-art genomic sequenceinference methods, obtaining up to 15% improvement in accuracy.

How Much Does GenoGuard Really "Guard"? An Empirical Analysis of Long-Term Security for Genomic Data