| // |
| // Copyright 2020 Google LLC |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| // |
| |
| package com.google.privacy.differentialprivacy; |
| |
| import com.google.privacy.differentialprivacy.proto.SummaryOuterClass.MechanismType; |
| import javax.annotation.Nullable; |
| |
| /** |
| * Interface for primitives that add noise to numerical data, for use in differential privacy |
| * operations. |
| */ |
| public interface Noise { |
| |
| double addNoise( |
| double x, int l0Sensitivity, double lInfSensitivity, double epsilon, @Nullable Double delta); |
| |
| long addNoise( |
| long x, int l0Sensitivity, long lInfSensitivity, double epsilon, @Nullable Double delta); |
| |
| ConfidenceInterval computeConfidenceInterval( |
| double noisedX, |
| int l0Sensitivity, |
| double lInfSensitivity, |
| double epsilon, |
| @Nullable Double delta, |
| double alpha); |
| |
| ConfidenceInterval computeConfidenceInterval( |
| long noisedX, |
| int l0Sensitivity, |
| long lInfSensitivity, |
| double epsilon, |
| @Nullable Double delta, |
| double alpha); |
| |
| MechanismType getMechanismType(); |
| |
| static double getL1Sensitivity(int l0Sensitivity, double lInfSensitivity) { |
| return l0Sensitivity * lInfSensitivity; |
| } |
| |
| static double getL2Sensitivity(int l0Sensitivity, double lInfSensitivity) { |
| return Math.sqrt(l0Sensitivity) * lInfSensitivity; |
| } |
| |
| /** |
| * Calculates a value k s.t. with probability {@code rank} the result of {@link #addNoise} with |
| * the given parameters will be less or equal to k. |
| */ |
| double computeQuantile( |
| double rank, |
| double x, |
| int l0Sensitivity, |
| double lInfSensitivity, |
| double epsilon, |
| @Nullable Double delta); |
| } |