Detection and Resolution of Periodic Artifacts in OpenDP's Discrete Laplace Sampler
Researchers found periodic distortions in OpenDP's discrete Laplace sampler that violated privacy guarantees. By tracing outputs through every step of the sampling process, they pinpointed a numerical error in a low-level Bernoulli sampler function. A corrected implementation and an alternative Taylor series approach were developed, successfully eliminating these artifacts and restoring theoretical privacy bounds.