Topic: delete - page 137. (Read 165547 times)

import math
import random

# cryptonote transactions
# mixin = mixin level (outputs mixed in that are not yours)
# mixedIn = outputs by index (simulates ref by hash)
#     these are stored as a list of ints.
# unrevealed = number of revealed outputs mixed in.
#     these are stored as a list of ints.
# this assumes that all outputs are of the same size
# or at least equally mixable (gmaxwell/andytoshi scheme).
class transaction():
    def __init__(self, mixin, mixedIn, unrevealed):
        self.mixin = mixin
        self.mixedIn = mixedIn
        self.unrevealed = unrevealed

    def revealAllOutputs(self):
        while len(self.unrevealed) > 0:
            self.unrevealed.pop()

    # Remove outputs that have been revealed
    def revealOutput(self, outputIndex):
        if(self.unrevealed.count(outputIndex) > 0):
            self.unrevealed.remove(outputIndex)

    # Count number of unrevealed outputs
    def unrevealedOutputs(self):
        return len(self.unrevealed)

class ledger():
    def __init__(self, 
            transactionsTotalPerTrial, 
            numberOfTrials, 
            maximumMixinTested,
            revealPercentage):
        self.transactionsTotalPerTrial = transactionsTotalPerTrial
        self.numberOfTrials = numberOfTrials
        self.mixin = mixin
        self.revealPercentage = revealPercentage
        self.ledger = []
        self.knownRevealedOutputs = []
        
        for numberOfTransactions in range (0, transactionsTotalPerTrial):
            # if there aren't enough elements to list, then
            # just mixin as many elements as possible.
            if len(self.ledger) < self.mixin+1:
                mixedIn = []
                revealed = []

                for i in range(0, len(self.ledger)):
                    mixedIn.append(i)
                    revealed.append(i)

                self.ledger.append(transaction(len(self.ledger), mixedIn, revealed))

            # otherwise, pick some random elements to mix into
            # the ring signature and make a new tx.
            else:
                mixedIn = []
                revealed = []

                for i in range(0, self.mixin):
                    randomOutput = random.randint(0, len(self.ledger)-2)

                    # can't remix existing elements, so find an
                    # output we haven't mixed yet.
                    while (mixedIn.count(randomOutput) > 0):
                        randomOutput = random.randint(0, len(self.ledger)-2)
                    
                    mixedIn.append(randomOutput)
                    revealed.append(randomOutput)
                
                self.ledger.append(transaction(mixin, mixedIn, revealed))

        # choose your outputs to reveal.
        outputsToReveal = []
        for i in range(0, int(revealPercentage * transactionsTotalPerTrial)):
            randomOutput = random.randint(mixin, transactionsTotalPerTrial-1)
            while (outputsToReveal.count(randomOutput) > 0):
                randomOutput = random.randint(mixin, transactionsTotalPerTrial-1)
            outputsToReveal.append(randomOutput)
            
        # reveal the outputs by calling the recursive recursiveReveal 
        # function.
        self.recursiveReveal(outputsToReveal)
        
    def recursiveReveal(self, outputsToReveal):
        while len(outputsToReveal) > 0:
            revealedOutput = outputsToReveal.pop()

            # reveal all outputs for this output.
            self.ledger[revealedOutput].revealAllOutputs()
        
            # if it's been mixed somewhere, remove it
            # from that list.
            for i in range(0, transactionsTotalPerTrial):
                self.ledger[i].revealOutput(revealedOutput)
                
            self.knownRevealedOutputs.append(revealedOutput)
                
        # diff the ledger and outputsToRevealOriginal to uncover any 
        # newly revealed outputs via chain reactions.
        newlyRevealedOutputCount = 0
        newlyRevealedOutputs = []
        for i in range(mixin, transactionsTotalPerTrial):
            if self.ledger[i].unrevealedOutputs() == 0:
                if self.knownRevealedOutputs.count(i) == 0:
                    newlyRevealedOutputs.append(i)
                    newlyRevealedOutputCount += 1
    
        if newlyRevealedOutputCount == 0:
            return
        else:
            self.recursiveReveal(newlyRevealedOutputs)
            
    # count the number of totally revealed outputs and return them.
    def getTotallyRevealedOutputs(self):
        totallyRevealedOutputs = 0
        for i in range(mixin, transactionsTotalPerTrial):
            if self.ledger[i].unrevealedOutputs() == 0:
                totallyRevealedOutputs += 1
        
        return totallyRevealedOutputs

def getVariance(yourList, mean):
    length = float(len(yourList))
    sum = 0.0
	
    while len(yourList) > 0:
        x = yourList.pop()
        xDiffSquared = math.pow(x - mean, 2)
        sum += xDiffSquared

    return (sum / (length - 1))

transactionsTotalPerTrial = 2000
numberOfTrials = 25
maximumMixinTested = 7
revealPercentage = 0.50

# open file to write the results to disk.
f = open("results.txt","w")

f.write("Transactions per trial: " + str(transactionsTotalPerTrial) + "\n")
f.write("Number of trials : " + str(numberOfTrials) + "\n")
f.write("Maximum mixin tested: " + str(maximumMixinTested) + "\n")
f.write("Reveal percentage: " + str(revealPercentage * 100) + "%\n\n")

for mixin in range (1, maximumMixinTested+1):
    f.write("mixin = " + str(mixin) + "\n")

    allTrialResults = []
    
    for trial in range (0, numberOfTrials):
		# ledger is the list of all transactions
        trialLedger = ledger(transactionsTotalPerTrial, 
            numberOfTrials, 
            mixin,
            revealPercentage)
            
        totallyRevealedOutputs = float(trialLedger.getTotallyRevealedOutputs())

        # determine the ratio of revealed outputs.
        revealedOutputRatio = totallyRevealedOutputs / float(transactionsTotalPerTrial)

        # store this ratio.
        f.write(str(revealedOutputRatio) + ", ")
        allTrialResults.append(revealedOutputRatio)

    f.write("\n")
    
    averageOfAllTrials = reduce(lambda x, y: x + y, allTrialResults) / len(allTrialResults)
    varianceAllTrials = getVariance(allTrialResults, averageOfAllTrials)
    revealsFromChainReaction = averageOfAllTrials - revealPercentage
    nonAttackerRevealPercent = revealsFromChainReaction / (1-revealPercentage)
    f.write("Average revealed output ratio: " + str(averageOfAllTrials * 100) + "%\n")
    f.write("Reveals resulting from chain reaction: " + str(revealsFromChainReaction * 100) + "% +/- " + str(varianceAllTrials * 100) + "%\n")
    f.write("Percentage of non-attacker outputs revealed: " + str(nonAttackerRevealPercent * 100) + "%\n\n")

f.close()