//Runs the attack on one PUF model, the cores are used to evaluate the CRPs of one model (in parallel) so the method will run as fast as possible
public static double ClassicalAttackXORAPUFSingle(int bitNumber, int numXOR)
{
//Generate a PUF
double aPUFMean = 0.0;
double aPUFVar = 1.0;
double aPUFMeanNoise = 0.0;
double aPUFNoiseVar = 0.0;
//Create the XOR APUF
XORArbiterPUF xPUF = new XORArbiterPUF(numXOR, bitNumber, aPUFMean, aPUFVar, aPUFMeanNoise, aPUFNoiseVar);
//Arrays for storing the training data
sbyte[][] trainingData = new sbyte[AppConstants.TrainingSize][]; //these will be phi vectors
sbyte[][] allTrainingResponses = new sbyte[1][]; //first index PUF, second index sample
allTrainingResponses[0] = new sbyte[AppConstants.TrainingSize];
Random[] rGenArray = new Random[AppConstants.CoreNumber];
for (int i = 0; i < AppConstants.CoreNumber; i++)
{
rGenArray[i] = new Random((int)DateTime.Now.Ticks);
System.Threading.Thread.Sleep(10); //prevent the random number generators from being the same
}
DataGeneration.GenerateTrainingDataParallel(xPUF, trainingData, allTrainingResponses, rGenArray);
Console.Out.WriteLine("Data Generation Complete.");
//create the objective function for parallel runs
ObjectiveFunctionResponseXOR rObj = new ObjectiveFunctionResponseXOR();
//Start the attack run
var watch = System.Diagnostics.Stopwatch.StartNew();
Random randomGenerator = new Random((int)DateTime.Now.Ticks);;
int dimensionNumber = (bitNumber + 1) * xPUF.GetPUFNum(); //the weights of all the XOR APUFs
sbyte[] trainingResponse = allTrainingResponses[0];
//Generate the first solution randomly for CMA-ES
double[] firstSolution = new double[dimensionNumber];
for (int i = 0; i < firstSolution.Length; i++)
{
firstSolution[i] = randomGenerator.NextDouble();
}
Console.Out.WriteLine("Beginning CMA-ES");
//The next line uses maximum parallelism on a single run
CMAESCandidate solutionCMAES = CMAESMethods.ComputeCMAES(dimensionNumber, rObj, trainingData, trainingResponse, firstSolution, randomGenerator);
double solutionVal = solutionCMAES.GetObjectiveFunctionValue();
double[] computedSolution = solutionCMAES.GetWeightVector(); //store the solution in independent memory
Console.Out.WriteLine("CMA-ES finished.");
watch.Stop();
Console.Out.WriteLine("Elapsed Time is " + watch.ElapsedMilliseconds.ToString());
//turn off parallelism
AppConstants.UseParallelismOnSingleCMAES = false;
//measure the accuracy
Random randomGenerator2 = new Random((int)DateTime.Now.Ticks);
sbyte[][] testingData = new sbyte[AppConstants.TestingSize][]; //these will be phi vectors
sbyte[] testingResponse = new sbyte[AppConstants.TestingSize];
DataGeneration.GenerateTrainingData(xPUF, testingData, testingResponse, randomGenerator2);
double accMeasure = rObj.ObjFunValue(computedSolution, testingData, testingResponse);
Console.Out.WriteLine("The accuracy for the XOR APUF is " + accMeasure.ToString());
return(accMeasure);
}
