Essay about Getting to know a few Differential Private...

1.2. Differential Privacy to the rescue. Privacy is a major problem these days. Cheaper memory has led to immense amount of data continuously being accumulated in various databases across the world, from universities, companies to patient records, content and link graphs of social net-works, mobility traces in cellular networks, book and movie ratings, etc.—and there are many socially valuable uses to which it can potentially be put. But, as Netflix and others have discovered, even when data collectors try to protect the privacy of their customers by releasing anonymized or aggregated data, this data often reveals much more than intended, especially when it is combined with other data sources. This calls for the need to immediately†¦show more content†¦Such a method is highly applicative for a wide variety of applications, be it Netflix or Twitter data to be analyzed by a Data Scientist. An adversarial querier could not, for instance, obtain an accurate answer to the query â€Å"Has John followed Mark?† because the cost of such a query would exceed any reasonable privacy budget. Even though everything seems fine till now, the adversary can still attack the user’s data. This is because we have assumed that all that the adversary can notice is the output of the query. However, the adversary can also notice the time taken for the system to reply to the query. Such observations can be exploited to mount a covert-channel attack. To continue with our earlier example, the adversary might run a query that always re-turns zero as its result but that takes one hour to complete if John Doe follows Mark and less than a second otherwise. Both Airavat and PINQ would consider such a system to be secure since the output is differentially private. However, the adversary can still learn with perfect certainty whether John follows Mark—a blatant violation of differential privacy. Fortunately, the user’s access to the database only via queries leads to channels like power consumption [9] and electromagnetic radiation [5, 8] being ruled out, henceforth, leaving the adversary with just two channels: the privacy budget and the query completion time. TheseShow MoreRelatedEssay on Centers for Medicare and Medicaid Services and Reimbursement1324 Words   |  6 Pagesconsolidate, and take some measures. I would like to discuss some issues and steps APNs must take regarding reimbursement as followed. First, why do APNs not receive equal reimbursement? The Medicare Payment Advisory Commission examined the payment differentials between the clinicians and physicians. Since the nature of billing codes is imprecise, the Center for Medicare and Medicaid Services was not able to distinguish the different categories of clinicians who provide similar services. 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