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DP Lib 1.1.2

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@miracvbasaran miracvbasaran released this 07 Feb 14:47
v1.1.2
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This patch release only affects the Go DP Library and Privacy on Beam.

This fixes a privacy-impacting bug that only affects ThresholdedResult() function of dpagg.Count and pbeam.DistinctPrivacyId() without public partitions in Privacy on Beam where a conversion of a floating point threshold to an integer threshold caused the mechanism to exhibit a larger delta than specified. For example:

  • Calling ThresholdedResult() on a Count with (Epsilon: 1.0, Noise: Laplace, MaxPartitionsContributed=1.0) and thresholdDelta=1e-6 should use a threshold of 14.122363 but instead it used 14.0, which increased the thresholdDelta to 1.130165e-6.
  • Similarly, calling ThresholdedResult() on a Count with (Epsilon: 2.0, Noise: Laplace, MaxPartitionsContributed=1.0) and thresholdDelta=1e-4 should use a threshold of 5.258597 but instead it used 5.0, which increased the thresholdDelta to 1.677313e-4.

See the single commit for more details on the bug & the fix.

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