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SNAP: Efficient Extraction of Private Properties with Poisoning

Authors: Harsh Chaudhari, John Abascal, Alina Oprea, Matthew Jagielski, Florian Tramèr, Jonathan Ullman.

Code for our SNAP: Efficient Extraction of Private Properties with Poisoning paper that will appear at IEEE S&P 2023.

Running the Model Confidence attack

This version of our attack obtains the model confidences from the target models for the distinguishing test. The Label-Only version of our attack where the target model returns only the predicted label can be found in the 'label-only' branch of our repository. The following script modifies the training dataset, trains target and shadow models, runs the attack, and prints the results.

python run_attacks.py -dat [--dataset] -tp [--targetproperties] -t0 [--t0frac] -t1 [--t1frac] \
                      -sm [--shadowmodels] -p [--poisonlist] -d [--device] -fsub [--flagsub] \
                      -subcat [--subcategories] -q [--nqueries] -nt [--ntrials]

Each of the arguments can be set to one of the following:

dataset (string): "adult" -- Adult dataset
                  "census" -- Census-Income (KDD) dataset. (Link provided at the end to download the dataset).

targetproperties (string): An array representation of the list of target properties. 
                           e.g. '[(race, White), (sex, Male)]'
                    
t0frac (float): value between [0, 1] for t0 fraction of target property.

t1frac (float): value between [0, 1] for t1 fraction of target property. (t0 < t1)

shadowmodels (int): Number of shadow models per fraction. Default: 4.
                     
poisonlist (string): An array representation of the list of poisoning rates as decimals (between 0 and 1).
                     e.g. '[0.03, 0.05]'

device (string): PyTorch device
                 e.g. "mps" (for Apple Silicon), "cpu", "cuda"

flagsub (bool): If True, runs the optimized version of SNAP that poisons a subproperty of the target property.
                Make sure the original target property is large-sized (t0 > 0.1) for the optimized version.

subcategories (string): An array representation of the list of subproperties for the optimized version of SNAP.
                        e.g. '[(marital-status, Never-married)]'

nquereis (int): Number of black-box queries made to a target model. Default: 1000.

ntrials (int): The number of experimental trials to run. Default: 1.

An example to run SNAP attack on a medium-sized property :

python run_attack.py -tp="[(sex, Female),(occupation, Sales)]" -p="[0.006]" -t0=0.01 -t1=0.035

An example to run the optimized version of SNAP attack on large-sized property:

python run_attack.py -fsub=True -tp="[(race, White),(sex, Male)]" -subcat="[(marital-status, Never-married)]" -p="[0.03]" -t0=0.15 -t1=0.30

An example to run Property Existence attack on small-sized property:

python run_attack.py -tp="[(native-country, Germany]" -p="[0.0008]" -t0=0.0 -t1=0.001 -q 100

Link to Download Census: https://archive.ics.uci.edu/ml/datasets/Census-Income+(KDD). Download the dataset and place it in the 'dataset' folder.