Function smartnoise_runtime::utilities::mechanisms::laplace_mechanism

pub fn laplace_mechanism(
    value: f64, 
    epsilon: f64, 
    sensitivity: f64, 
    enforce_constant_time: bool
) -> Result<f64>

Returns noise drawn according to the Laplace mechanism

Noise is drawn with scale sensitivity/epsilon and centered about 0. For more information, see the Laplace mechanism in C. Dwork, A. Roth The Algorithmic Foundations of Differential Privacy, Chapter 3.3 The Laplace Mechanism p.30-37. August 2014.

NOTE: this implementation of Laplace draws is likely non-private due to floating-point attacks See Mironov (2012) for more information

Arguments

• value - Statistic to be privatized.
• epsilon - Multiplicative privacy loss parameter.
• sensitivity - Upper bound on the L1 sensitivity of the function you want to privatize.
• enforce_constant_time - Whether or not to enforce the algorithm to run in constant time

Return

A single value drawn from the Laplace distribution with scale sensitivity/epsilon centered about 0.

Examples

use smartnoise_runtime::utilities::mechanisms::laplace_mechanism;
let n = laplace_mechanism(22.3, 0.1, 2.0, false);