def applyCountermeasure( trace, metadata ):
[targetDistributionBi,
targetDistributionUp,
targetDistributionDown] = metadata
newTrace = Trace(trace.getId())
# primary sampling
timeCursor = 0
for packet in trace.getPackets():
timeCursor = packet.getTime()
targetDistribution = targetDistributionDown
if packet.getDirection()==Packet.UP:
targetDistribution = targetDistributionUp
packets = DirectTargetSampling.morphPacket( packet, targetDistribution )
for newPacket in packets:
newTrace.addPacket( newPacket )
# secondary sampling
while True:
l1Distance = newTrace.calcL1Distance( targetDistributionBi )
if l1Distance <= DirectTargetSampling.L1_THRESHHOLD:
break
timeCursor += 10
newDirection, newLen = newTrace.getMostSkewedDimension( targetDistributionBi )
packet = Packet( newDirection, timeCursor, newLen )
newTrace.addPacket( packet )
return newTrace
def applyCountermeasure(trace, metadata):
[
targetDistributionBi, targetDistributionUp, targetDistributionDown,
srcDistributionUp, srcDistributionDown, morphingMatrixUp,
morphingMatrixDown
] = metadata
newTrace = Trace(trace.getId())
# primary sampling
timeCursor = 0
for packet in trace.getPackets():
timeCursor = packet.getLength()
index = (packet.getLength() - Packet.HEADER_LENGTH) / 8
targetDistribution = None
morphingColumn = None
if packet.getDirection() == Packet.UP:
if morphingMatrixUp:
morphingColumn = morphingMatrixUp[:, index]
else:
targetDistribution = targetDistributionUp
targetDistributionSecondary = targetDistributionUp
else:
if morphingMatrixDown:
morphingColumn = morphingMatrixDown[:, index]
else:
targetDistribution = targetDistributionDown
targetDistributionSecondary = targetDistributionDown
if morphingColumn:
targetDistribution = {}
for i in range(len(morphingColumn)):
key = str(packet.getDirection()) + '-' + str(
i * 8 + Packet.HEADER_LENGTH)
targetDistribution[key] = morphingColumn[i]
packets = WrightStyleMorphing.morphPacket(
packet, targetDistribution, targetDistributionSecondary)
for newPacket in packets:
newTrace.addPacket(newPacket)
# secondary sampling
while True:
l1Distance = newTrace.calcL1Distance(targetDistributionBi)
if l1Distance <= WrightStyleMorphing.L1_THRESHHOLD:
break
timeCursor += 10
newDirection, newLen = newTrace.getMostSkewedDimension(
targetDistributionBi)
packet = Packet(newDirection, timeCursor, newLen)
newTrace.addPacket(packet)
return newTrace
def applyCountermeasure( trace, metadata ):
[targetDistributionBi,
targetDistributionUp,
targetDistributionDown,
srcDistributionUp,
srcDistributionDown,
morphingMatrixUp,
morphingMatrixDown] = metadata
newTrace = Trace(trace.getId())
# primary sampling
timeCursor = 0
for packet in trace.getPackets():
timeCursor = packet.getLength()
index = (packet.getLength()-Packet.HEADER_LENGTH)/8
targetDistribution = None
morphingColumn = None
if packet.getDirection()==Packet.UP:
if morphingMatrixUp:
morphingColumn = morphingMatrixUp[:,index]
else:
targetDistribution = targetDistributionUp
targetDistributionSecondary = targetDistributionUp
else:
if morphingMatrixDown:
morphingColumn = morphingMatrixDown[:,index]
else:
targetDistribution = targetDistributionDown
targetDistributionSecondary = targetDistributionDown
if morphingColumn:
targetDistribution = {}
for i in range(len(morphingColumn)):
key = str(packet.getDirection())+'-'+str( i*8 + Packet.HEADER_LENGTH )
targetDistribution[key] = morphingColumn[i]
packets = WrightStyleMorphing.morphPacket( packet, targetDistribution, targetDistributionSecondary )
for newPacket in packets:
newTrace.addPacket( newPacket )
# secondary sampling
while True:
l1Distance = newTrace.calcL1Distance( targetDistributionBi )
if l1Distance <= WrightStyleMorphing.L1_THRESHHOLD:
break
timeCursor += 10
newDirection, newLen = newTrace.getMostSkewedDimension( targetDistributionBi )
packet = Packet( newDirection, timeCursor, newLen )
newTrace.addPacket( packet )
return newTrace
