-
Notifications
You must be signed in to change notification settings - Fork 1
/
system.py
553 lines (500 loc) · 23 KB
/
system.py
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
import tkinter as tk
from PIL import Image, ImageTk
from channel import *
class System:
def __init__(self):
#channel handles Alice, Bob, and Eve
self.channel = None
#information about the current state of the simulation
self.currentStep = 0
self.number_of_error_steps = 0
self.phase = 0
#storage of label objects
self.phase1Objects = []
self.phase2Objects = []
self.phase3Objects = []
self.phase4Objects = []
#helper variable for plotting
self.two_values = []
#set up tkinter window
self.initializeTkinter()
def go_to_next_phase(self):
"""prepares variables and menu for the upcoming phase"""
#transmission and measurement of qubits
if self.phase ==0:
number = self.getNumber("probability")
while number==None:
number = self.getNumber("probability")
self.channel = Channel(number)
self.go_to_phase1(number)
#key sifting
elif self.phase ==1:
self.go_to_phase2()
#calculation of error rate
elif self.phase ==2:
self.go_to_phase3()
#error correction
elif self.phase ==3:
self.go_to_phase4()
#privacy amplification
elif self.phase ==4:
self.channel.preparePostprocessing()
self.go_to_phase5()
self.two_values = []
self.number_of_error_steps = 0
self.phase += 1
def simulate_one_cycle(self):
"""Alice generates one qubit, Bob (and possibly Eve) measures it,
result is displayed in window"""
plottingList = self.channel.simulate_one_cycle(self.currentStep)
self.displaying(self.currentStep, plottingList)
self.currentStep += 1
def simulate_multiple_cycle(self):
"""Alice generates a by the user defined number of qubits, Bob (and
possibly Eve) measures it, results are displayed in window"""
number = int(self.getNumber("int"))
while number==None:
number = self.getNumber("int")
for i in range(number):
self.simulate_one_cycle()
def initializeTkinter(self):
"""Tkinter setup and preparation of the start-menu"""
self.window = tk.Tk()
self.menu_frame = tk.Frame(master=self.window)
self.menu_frame.grid(row=0, column =0)
self.process_frame = tk.Frame(master=self.window)
self.process_frame.grid(row=0, column =1)
self.phase_label = tk.Text(master = self.menu_frame,
width=25, height=10)
self.phase_label.grid(row=0, column = 0)
self.phase_label.insert(tk.END, 'Hey, welcome to this\nsimulation of the BB84\nprotocol.\nPlease select the\neavesdropping rate\n(e.g. 0 for no\neavesdropper, 0.3 for\n30 % eavesdropping):')
self.entry_frame = tk.Frame(master=self.menu_frame, width=25, height=3)
self.entry_frame.grid(row=3, column=0)
self.main_label = tk.Label(master= self.entry_frame, text="Enter eavesdropping rate")
self.main_label.grid(row=0,column=0)
self.entry = tk.Entry(master=self.entry_frame)
self.entry.grid(row=1,column=0)
self.empty_space = tk.Label(master = self.menu_frame, width=25,
height=5)
self.empty_space.grid(row=1, column=0)
self.empty_space2 = tk.Label(master = self.menu_frame, width=25,
height=5)
self.empty_space2.grid(row=2, column=0)
self.btn_3 = tk.Button(master=self.menu_frame,
text="Start",
width=25,
height=5,
command = self.go_to_next_phase
)
self.btn_3.grid(row=4, column=0)
self.btn_4 = tk.Button(master=self.menu_frame,
text="Exit",
width=25,
height=5,
command = self.window.destroy
)
self.btn_4.grid(row=5,column=0)
self.window.mainloop()
def getNumber(self, typeArgument):
"""returns number entered by the user, raises exceptions in invalid
cases"""
try:
#get number
number = float(self.entry.get())
self.entry.delete(0,tk.END)
try:
#check if value ranges are respected
if typeArgument=="probability" and (number<0 or number>1):
raise ValueError("A probability must be between 0 and 1")
elif typeArgument=="int" and number<=0:
raise ValueError("The number must be positive")
return number
except ValueError:
#tell user to reenter a valid number
self.errorwindow = tk.Tk()
label = tk.Label(master=self.errorwindow, text='Please pay attention to the allowed value ranges')
label.grid(row=0, column=0)
button = tk.Button(master=self.errorwindow, text="OK", width=15,
height=5, command = self.errorwindow.destroy)
button.grid(row=1, column=0)
return None
except:
#tell user to enter number
self.errorwindow = tk.Tk()
label = tk.Label(master=self.errorwindow, text='Please enter a number')
label.grid(row=0, column=0)
button = tk.Button(master=self.errorwindow, text="OK", width=15,
height=5, command = self.errorwindow.destroy )
button.grid(row=1, column=0)
def go_to_phase1(self, number):
"""displays menu and table layout for phase "transmission and
measurement of qubits"""
#prepare setup for efficient displaying of qubits
if number >0:
self.eavesdropper = True
self.indexList = [0,1,4,5]
self.eList = [2,3]
else:
self.indexList = [0,1,2,3]
self.eList = []
self.eavesdropper = False
#setup table for dispaying of qubits
self.phase1_frame =tk.Frame(master=self.process_frame)
self.phase1_frame.grid(row=0, column=0)
label = tk.Label(self.phase1_frame, text='Alice', width = 10, height = 2)
label.grid(row=0,column=0)
label_b = tk.Label(self.phase1_frame, text='Bob', width = 10, height = 2)
text = ["Bit", "Basis", "Qubit"]
if self.eavesdropper:
label = tk.Label(self.phase1_frame, text='Eve', width = 10, height = 2)
label.grid(row=3,column=0)
label_b.grid(row=6,column=0)
labels = text * 2
else:
label_b.grid(row=3,column =0)
labels = text
labels = labels + text[:2]
for i in range(len(labels)):
if i%3==2:
h = 3
else:
h=2
label = tk.Label(master=self.phase1_frame, text=labels[i], width = 10, height = h)
label.grid(row = i, column = 1)
#setup menu
self.phase_label.delete(1.0, tk.END)
self.phase_label.insert(tk.END,"Phase 1: Transmission of qubits")
self.empty_space.grid_forget()
self.btn_1 = tk.Button(master=self.menu_frame,
text="Simulate one cycle",
width=25,
height=5,
bg="grey",
fg="black",
command = self.simulate_one_cycle
)
self.btn_1.grid(row=1,column=0)
self.empty_space2.grid_forget()
self.btn_2 = tk.Button(master=self.menu_frame,
text="Simulate multiple cycles",
width=25,
height=5,
command = self.simulate_multiple_cycle
)
self.btn_2.grid(row=2,column=0)
self.main_label['text']="Number of cycles"
self.empty_space3 = tk.Label(master = self.entry_frame, width=25,
height=3)
self.btn_3['text']="Go to next phase"
self.btn_3.grid_forget()
self.empty_space.grid(row=4,column=0)
def go_to_phase2(self):
"""display menu for phase "key sifting" """
self.phase_label.delete(1.0, tk.END)
self.phase_label.insert(tk.END,'Phase 2: Key Sifting')
self.btn_1['text'] = 'Compare bases'
self.btn_2.grid_remove()
self.btn_3.grid_forget()
self.empty_space2.grid(row=2, column=0)
self.empty_space.grid(row=4, column =0)
self.btn_1['command'] = self.compare_bases
self.main_label.grid_forget()
self.entry.grid_forget()
self.empty_space3.grid(row=0, column=0)
def go_to_phase3(self):
"""display menu for phase "calculation of error rate" """
self.empty_space3.grid_forget()
self.phase_label.delete(1.0, tk.END)
self.phase_label.insert(tk.END,'Phase 3: Error rate')
self.btn_1['text'] = 'Compute error rate'
self.main_label['text'] = 'Choose number of samples'
self.btn_1['command'] = self.error_rate
self.entry.grid(row=1,column=0)
self.main_label.grid(row=0, column=0)
self.btn_3.grid_forget()
self.empty_space.grid(row=4, column =0)
def go_to_phase4(self):
"""display menu for phase "error correction" """
self.main_label.grid_forget()
self.entry.grid_forget()
self.empty_space3.grid(row=0, column=0)
self.phase_label.delete(1.0, tk.END)
self.phase_label.insert(tk.END,'Phase 4: Error correction')
self.btn_1['text'] = 'One error correction step'
self.empty_space2.grid_remove()
self.btn_2['text'] = 'All error correction at once'
self.btn_2.grid(row=2,column=0)
self.btn_1['command'] = self.error_correction_one_step
self.btn_2['command'] = self.error_correction
self.phase4_frame = tk.Frame(master=self.process_frame)
self.phase4_frame.grid(row=4,column=0)
row_b = self.setUpNames(self.phase4_frame)
def go_to_phase5(self):
"""display menu for phase "privacy amplification" """
self.phase_label.delete(1.0, tk.END)
self.phase_label.insert(tk.END,'Phase 5: Privacy amplification (PA)')
self.btn_1['text'] = 'One PA step'
self.btn_2['text'] = 'All PA steps at once'
self.btn_1['command'] = self.privacy_amplification_one_step
self.btn_2['command'] = self.privacy_amplification
self.btn_3.grid_forget()
self.empty_space.grid(row=4, column=0)
self.phase5_frame = tk.Frame(master=self.process_frame)
self.phase5_frame.grid(row=5,column=0)
row_b = self.setUpNames(self.phase5_frame)
def displaying(self, number, plottingList):
"""display the transmission and measurement of one qubit in the
tkinter window"""
objects = []
rn=0
images = 0
for i in plottingList:
if i[0]!=-1:
label = tk.Label(master=self.phase1_frame, text=str(i[0]), width=2, height=2)
label.grid(row=rn, column=2+number)
objects.append(label)
rn+=1
if i[1]==0:
basis = '+'
else:
basis = 'x'
label2 = tk.Label(master=self.phase1_frame, text=basis, width=2, height=2)
label2.grid(row=rn, column=2+number)
rn+=1
objects.append(label2)
if images!=len(plottingList)-1:
name = str(i[0])+str(i[1])+'.png'
load = Image.open(name)
render = ImageTk.PhotoImage(load)
img = tk.Label(master=self.phase1_frame, image=render)
img.image = render
img.grid(row=rn, column=2+number)
rn+=1
images+=1
else:
objects.append(None)
objects.append(None)
rn+=3
images+=1
self.phase1Objects.append(objects)
if self.currentStep == 0:
self.empty_space.grid_forget()
self.btn_3.grid(row=4, column=0)
def compare_bases(self):
"""perform the step key sifting and display the result"""
for i in range(self.currentStep):
#determine of bases are the same
value = self.channel.compareBasis(i)
#highlight in green if so
if value:
for n in self.indexList:
self.phase1Objects[i][n]['background']='green2'
if self.eavesdropper:
if self.channel.compareBasisE(i):
for n in self.eList:
self.phase1Objects[i][n]['background']='pale green'
#replace the bit arrays by the new ones
self.channel.replaceKey()
#display the new bit arrays
self.phase2_frame = tk.Frame(master=self.process_frame)
self.phase2_frame.grid(row=1,column=0)
row_b = self.setUpNames(self.phase2_frame)
offset =2
tmp = []
bitArray = self.channel.getBits()
for n in range(len(bitArray[0])):
for i in range(len(bitArray)):
if bitArray[i][n] !=-1:
label = tk.Label(master=self.phase2_frame, text=str(bitArray[i][n]), width=2, height=2)
label.grid(row=1+i, column=offset+n)
if len(bitArray)==2 or i!=1:
tmp.append(label)
self.phase2Objects.append(tmp)
tmp = []
#display go-to-next-phase button
self.empty_space.grid_forget()
self.btn_3.grid(row=4, column=0)
def setUpNames(self, frame):
"""displays the table header in a given frame"""
label = tk.Label(master=frame, text="Shared Key",width = 10, height = 2)
label.grid(row=0,column=1)
label_a = tk.Label(master=frame, text='Alice',width = 10, height = 2)
label_a.grid(row=1,column=1)
if self.eavesdropper:
label_e = tk.Label(master=frame, text='Eve',width = 10, height = 2)
label_e.grid(row=2, column=1)
row_b=3
else:
row_b=2
label_b = tk.Label(master=frame, text='Bob',width = 10, height = 2)
label_b.grid(row=row_b, column=1)
return row_b
def error_rate(self):
"""calculates the error rate on a random subsample of the size that
the user specified"""
number = int(self.getNumber("int"))
while number==None:
number = self.getNumber("int")
if number > self.channel.a.getArrayLength():
number == self.channel.a.getArrayLength()-1
#get subset for error calculation
subset = self.channel.getSubset(number)
counter = 0
for i in subset:
#display subset for calculation
for label in self.phase2Objects[i]:
label['background'] = 'orange'
#count errors
if self.channel.compareBit(i)==False:
counter+=1
#calculate error
error=float(counter)/float(len(subset))
#display results
self.phase3_frame = tk.Frame(master=self.process_frame)
self.phase3_frame.grid(row=2, column=0)
error_label = tk.Label(master=self.phase3_frame, text = 'The error rate is ' + str(error) + '. Do you want to abort or continue with postprocessing?' )
error_label.grid(row=0, column=0)
self.button_frame = tk.Frame(master=self.phase3_frame)
self.button_frame.grid(row=1, column=0)
#give the user the choice to abort or to continue
button_abort = tk.Button(master=self.button_frame, text = 'Abort', command = self.abort)
button_abort.grid(row=0, column=0)
button_continue = tk.Button(master=self.button_frame, text = 'Continue with postprocessing', command = self.continue_postprocessing)
button_continue.grid(row=0,column=1)
def continue_postprocessing(self):
"""displays table after the error rate calculation"""
self.channel.forgetIndices()
self.button_frame.grid_forget()
self.button_frame.destroy()
frame = tk.Frame(master=self.process_frame)
frame.grid(row=3,column=0)
row_b = self.setUpNames(frame)
offset = 2
tmp = []
bitArray = self.channel.getBits()
for n in range(len(bitArray[0])):
for i in range(len(bitArray)):
if bitArray[i][n] !=-1:
label = tk.Label(master=frame, text=str(bitArray[i][n]), width=2, height=2)
label.grid(row=1+i, column=offset+n)
if len(bitArray)==2 or i!=1:
tmp.append(label)
self.phase3Objects.append(tmp)
tmp = []
self.go_to_next_phase()
def error_correction_one_step(self):
"""performs and displays one step of XOR error correction"""
#color previously handled values in a different color
for item in self.two_values:
for label in self.phase3Objects[item]:
label['background']='yellow'
#get results of error correction
self.two_values, keep, valice, vbob, ve = self.channel.errorCorrectionOneStep()
#if there are enough values to do one step
if self.two_values!=None:
#highlight selected values, position 0 in dark orange, position 1
#in light orange
for label in self.phase3Objects[self.two_values[0]]:#self.indices.index(i)]:
label['background']='dark orange'
for label in self.phase3Objects[self.two_values[1]]:#self.indices.index(i)]:
label['background']='orange'
#display result
if keep:
tmp = []
label_a = tk.Label(master = self.phase4_frame, text = str(valice), width=2, height=2)
label_a.grid(row=1, column=2+self.number_of_error_steps)
if ve!=-1:
label_e = tk.Label(master = self.phase4_frame, text = str(ve), width=2, height=2)
label_e.grid(row=2, column=2+self.number_of_error_steps)
label_b = tk.Label(master = self.phase4_frame, text = str(vbob), width=2, height=2)
if self.eavesdropper: row_b =3
else: row_b=2
label_b.grid(row=row_b, column=2+self.number_of_error_steps)
tmp.append(label_a)
tmp.append(label_b)
self.phase4Objects.append(tmp)
self.number_of_error_steps +=1
#if there are not enough value to do one step
else:
#display go-to-next-phase button
self.empty_space.grid_forget()
self.btn_3.grid(row=4, column=0)
def error_correction(self):
"""perform all possible error correction steps"""
while self.two_values!=None:
self.error_correction_one_step()
#display go-to-next-phase button
self.empty_space.grid_forget()
self.btn_3.grid(row=4, column=0)
def privacy_amplification_one_step(self):
"""performs and displays one step of XOR privacy amplification"""
#color previously handled values in a different color
for item in self.two_values:
for label in self.phase4Objects[item]:
label['background']='yellow'
#get results of privacy amplification
self.two_values, valice, vbob, veve = self.channel.privacyAmplificationOneStep()
#if there are enough values to do one step
if self.two_values!=None:
#highlight selected values
for i in self.two_values:
for label in self.phase4Objects[i]:#self.indices.index(i)]:
label['background']='orange'
#display result
label_a = tk.Label(master = self.phase5_frame, text = str(valice), width=2, height=2)
label_a.grid(row=1, column=2+self.number_of_error_steps)
if veve !=-1:
label_e = tk.Label(master = self.phase5_frame, text = str(veve), width=2, height=2)
label_e.grid(row=2, column=2+self.number_of_error_steps)
if self.eavesdropper: row_b =3
else: row_b=2
label_b = tk.Label(master = self.phase5_frame, text = str(vbob), width=2, height=2)
label_b.grid(row=row_b, column=2+self.number_of_error_steps)
self.number_of_error_steps +=1
#if there are not enough values to do one step
else:
#start finish routine
self.finish_routine()
def privacy_amplification(self):
"""performs all possible privacy amplification steps"""
while self.two_values!=None:
self.privacy_amplification_one_step()
def finish_routine(self):
"""prepares menu for restart and displays message about result"""
self.btn_3['text'] = 'Restart'
self.btn_3['command'] = self.restart
self.empty_space.grid_forget()
self.btn_1.grid_forget()
self.btn_2.grid_forget()
self.empty_space.grid(row=1, column=0)
self.empty_space2.grid(row=2, column=0)
self.btn_3.grid(row=4, column=0)
frame = tk.Frame(master = self.process_frame)
frame.grid(row=6, column=0)
self.channel.replaceKey()
sharedKey, private = self.channel.compareFinalKeys()
if sharedKey:
if private:
displayText = 'Congratulations. You have obtained a shared private key. You can try again or exit.'
else:
displayText = 'Unfortunately, Eve knows at least parts of your shared private key. You might want to try again by clicking on restart.'
else:
displayText = 'Unfortunately, you have not obtained the same private key. You might want to try again by clicking on restart.'
label = tk.Label(master=frame, text=displayText)
label.grid(row=0, column=0)
def restart(self):
"""resets all necessary values and restarts tkinter"""
self.window.destroy()
self.channel = None
self.currentStep = 0
self.number_of_error_steps = 0
self.phase = 0
self.phase1Objects = []
self.phase2Objects = []
self.phase3Objects = []
self.phase4Objects = []
self.two_values = []
self.initializeTkinter()
def abort(self):
"""restarts program"""
self.restart()