Sat, 19 March 2016, 02:00 UTC — Mon, 21 March 2016, 02:00 UTC 

On-line

BCTF event.

Format: Jeopardy Jeopardy

Official URL: http://bctf.xctf.org.cn/

This event's future weight is subject of public voting!

Future weight: 33.33 

Rating weight: 33.33 

Event organizers 

no logo

Scoreboard

573 teams total

PlaceTeamCTF pointsRating points
1 Plaid Parliament of Pwning 5275.00066.660
2 217 4979.00048.125
3 Shellphish 3567.00033.648
4 TokyoWesterns 3525.00030.605
5 !SpamAndHex 3410.00028.212
6 Nu1L 3315.00026.501
7 FlappyPig 3016.00023.818
8 0ops 2941.00022.749
9 BambooFox 2721.00020.896
10 Dragon Sector 2660.00020.140
11 四川无声-PKAV 2570.00019.269
12 dcua 2510.00018.637
13 ASIS 2310.00017.160
14 没有一个系统是安全的 2210.00016.345
15 DuRaRaRa!! 2012.00014.935
16 scryptos 2011.00014.790
17 Never Stop Exploiting 2010.00014.661
18 p4 1960.00014.236
19 Bushwhackers 1960.00014.138
20 ROIS 1913.00013.754
21 Tasteless 1861.00013.346
22 LC↯BC 1816.00012.989
23 DeliciousHorse 1660.00011.938
24 Azure Assassin Alliance 1611.00011.568
25 SHARK 1610.00011.506
26 Batman's Kitchen 1610.00011.455
27 BabyPhD 1564.00011.117
28 Destructive Voice 1460.00010.415
29 OldTeam 1411.00010.065
30 BreakPoint 1310.0009.388
31 MV9rwGOf08 1310.0009.352
32 w0pr 1261.0009.009
33 Sigma 1210.0008.655
34 b01lers 1115.0008.025
35 Capture the Swag 1110.0007.966
36 int3pids 1110.0007.939
37 CLGT 1065.0007.630
38 Snatch The Root 1060.0007.575
39 Dawn 1060.0007.552
40 Lancet 1010.0007.215
41 dodododo 961.0006.885
42 LittleTips 960.0006.859
43 smoke leet everyday 960.0006.841
44 0x8F 960.0006.823
45 0xFA 910.0006.490
46 天枢 910.0006.474
47 KITCTF 860.0006.143
48 hxp 860.0006.128
49 ****** 815.0005.830
50 Hexpresso 815.0005.816
51 Mammon Machine 811.0005.778
52 xil.se 763.0005.462
53 Fourchette Bombe 715.0005.147
54 PwnThyBytes 710.0005.103
55 0x90r00t 710.0005.092
56 Raccoons 710.0005.081
57 WildWolf 665.0004.787
58 urandom 660.0004.745
59 0daysober 660.0004.735
60 noraneco 610.0004.410
61 TOIH 610.0004.401
62 vang1ong7ang 610.0004.392
63 squareroots 560.0004.067
64 Tower of Hanoi 510.0003.743
65 RingZer0 Team 510.0003.735
66 SDT 510.0003.727
68 mrx 510.0003.713
69 Yahoo knows him 510.0003.705
70 Melon 510.0003.699
71 Erio 504.0003.654
72 FluxFingers 500.0003.622
73 Thanos 460.0003.363
74 XDay 460.0003.357
75 Yozakura 410.0003.035
76 irGeeks 410.0003.029
77 yakinikyuu 360.0002.708
78 Samurai 360.0002.702
79 khack40 360.0002.697
80 PiggyBird 360.0002.691
81 Singularity 360.0002.686
82 Ring4 360.0002.681
83 WatchWolf 360.0002.676
84 WISEYE 360.0002.671
85 Antarctica-momo 360.0002.667
86 AK95 360.0002.662
87 CyKOR 360.0002.658
88 9447 360.0002.653
89 VXRL 360.0002.649
90 RooterX 360.0002.645
91 Hackeriet 360.0002.641
92 dtuhax 360.0002.637
93 DOFE 350.0002.570
94 QuokkaLight 260.0001.997
95 Ping-Mic 260.0001.994
96 宫保鸡丁 260.0001.990
97 vinamilk 260.0001.986
98 仙人球s 250.0001.920
99 United Exploit Directorate 210.0001.664
100 Tomatosalad 210.0001.660
101 IS☢LA 210.0001.657
102 No Internet Access 210.0001.654
103 ¯\__(ツ)__/¯ 210.0001.650
104 efiens 210.0001.647
105 covart 210.0001.644
106 Blue-Whale 210.0001.641
107 snake 210.0001.638
108 Lilac 210.0001.635
109 莲子百合 210.0001.633
110 zj9s.0kami 210.0001.630
111 好帽子 210.0001.627
112 6l0ry 210.0001.624
113 Tester 210.0001.622
114 tank1st99 210.0001.619
115 Sonic_Rainboom 210.0001.617
116 TusanHomichi 210.0001.614
117 morganFr33man 210.0001.612
118 Retired - Fast Affine Projection 210.0001.609
119 QAQAQ 210.0001.607
120 Bono_iPad 210.0001.605
121 55_AA 200.0001.539
122 银河战队 200.0001.537
123 i3r0_9R3 200.0001.535
124 .elite 200.0001.532
125 55-AA 200.0001.530
126 NIS 160.0001.275
127 VeCtOr 160.0001.273
128 ISITDTU 160.0001.271
129 Cyber-1 160.0001.269
130 Execut3 160.0001.267
131 xSTF 160.0001.265
132 Securimag 160.0001.263
133 Fr0g_Fl4g 160.0001.262
134 HoT 160.0001.260
135 Vegan Zombies 160.0001.258
136 wasamusume 160.0001.256
137 Hackstangs 160.0001.254
138 participe_ctf 160.0001.252
139 isbaiws 160.0001.251
140 0x4556368625 160.0001.249
142 1up 160.0001.246
143 Magic Hat 160.0001.244
144 HackCat 160.0001.242
145 Shadow Cats 160.0001.241
146 KaisHack 160.0001.239
147 err0r-451 160.0001.238
148 r00t@b00t 160.0001.236
149 th3jackers 160.0001.235
150 Улаанбаатар 160.0001.233
151 Come to Try Fortune 160.0001.232
152 LeetSpeak 160.0001.230
153 Back 160.0001.229
154 学生会 160.0001.227
155 Cust1607 160.0001.226
156 Invulnerable 160.0001.225
157 PeakChaos 160.0001.223
158 HackXore 160.0001.222
159 Master Ironbar 160.0001.221
160 TheGoonies 160.0001.219
161 DjigIT 160.0001.218
162 Espacio 160.0001.217
164 splarcit 160.0001.214
165 OpenToAll 160.0001.213
166 NULLify 160.0001.212
167 weekendterminator 160.0001.211
168 CooCoo 160.0001.209
170 cpaw 160.0001.207
171 ctffuntik 160.0001.206
172 omakase 160.0001.205
173 Shady.Solutions 160.0001.204
174 zongsjs 160.0001.203
175 TeamRedAce 160.0001.201
176 mau5 160.0001.200
177 sutechCTF 160.0001.199
178 aliceisdead 160.0001.198
179 Ivaniko 160.0001.197
180 dephault 160.0001.196
182 iSome 10.0000.246
183 NeOLux-C1Ph3r 10.0000.245
184 bitbitbit 10.0000.244
185 GNUnu 10.0000.243
186 PHCN 10.0000.242
187 beatles 10.0000.241
188 op.rad 10.0000.240
189 jibashiri 10.0000.240
190 Kam1nariKrowz 10.0000.239
191 None 10.0000.238
192 TenDollar 10.0000.237
193 Just Hit the Core 10.0000.236
194 CorpOfHack 10.0000.235
195 Tiger 10.0000.234
196 LosFuzzys 10.0000.233
197 DB-Time 10.0000.232
198 Bits For Everyone 10.0000.232
199 D@rk$h3ll 10.0000.231
200 HHH 10.0000.230
201 Hitch 10.0000.229
202 CTFPractice 10.0000.228
203 ByteShredders 10.0000.227
204 ffx 10.0000.227
205 FarmingSimulator2015Game.exe 10.0000.226
206 4rr0w 10.0000.225
207 波霸 10.0000.224
208 SAINTSEC 10.0000.223
209 mc_te4m 10.0000.223
210 UQAM Dank Again 10.0000.222
211 A&D 10.0000.221
212 g0tiu5a 10.0000.220
213 8-bit 10.0000.220
214 WhatTheSheep 10.0000.219
215 CTF-infinit 10.0000.218
216 0wn3r5 10.0000.217
217 xnianq 10.0000.217
218 Cat-n-Fish 10.0000.216
219 PLUS 10.0000.215
220 IngloriousMonkeys 10.0000.215
221 ALLES! 10.0000.214
222 HackingForSoju 10.0000.213
223 大王叫我来巡山 10.0000.213
224 Guardians 10.0000.212
225 9SOC 10.0000.211
226 Sanya_Bay 10.0000.211
227 FAUST 10.0000.210
228 gabbar 10.0000.209
229 Pcthon 10.0000.209
230 4diamond 10.0000.208
231 WE_0WN_Y0U 10.0000.207
232 PENSIUN | DFCI | SUKSMA 10.0000.207
233 ReallyNonamesFor 10.0000.206
234 r3b00+ 10.0000.206
235 KXTI_t 10.0000.205
236 wtfmehftw 10.0000.204
237 Neg9 10.0000.204
239 undefined 10.0000.203
240 小红帽 10.0000.202
241 Pwnelaide 10.0000.201
242 菜鸡 10.0000.201
243 2523@1 10.0000.200
244 eM00 10.0000.200
245 b0tch_sec 10.0000.199
246 打酱油 10.0000.199
247 amn3s1a 10.0000.198
248 Iq tracking 10.0000.198
249 LQYMGT 10.0000.197
250 popo 10.0000.197
251 WL 10.0000.196
252 crayontheft 10.0000.195
253 Internetwache 10.0000.195
254 Checkmeout 10.0000.194
255 Rosenburg Engel 10.0000.194
256 Vidar 10.0000.193
257 Avidya 10.0000.193
258 Aurora 10.0000.192
259 ghost@/bin/sh 10.0000.192
260 zjgsu_ljj 10.0000.191
261 FqTW 10.0000.191
262 objEEdump 10.0000.190
263 GlandOS 10.0000.190
264 woniu507 10.0000.189
265 shaguo 10.0000.189
266 Brutewoorse 10.0000.188
267 BITSkrieg 10.0000.188
268 zexec1 10.0000.188
269 WS5TYnBoZg== 10.0000.187
270 Alone 10.0000.187
271 CSI 10.0000.186
272 中國網警 10.0000.186
273 aaa- 10.0000.185
274 watch0ut 10.0000.185
275 websec 10.0000.184
276 X1cT34m 10.0000.184
277 周姑娘 10.0000.184
278 SUS 10.0000.183
279 213 10.0000.183
280 F4nt45i4 10.0000.182
281 nwpusec 10.0000.182
282 GetFlag 10.0000.181
283 潇洒哥 10.0000.181
284 马场理工学院 10.0000.181
285 Syclover 10.0000.180
286 ALLXss 10.0000.180
287 Vic 10.0000.179
288 千年风雅 10.0000.179
289 德玛西亚 10.0000.179
290 Cl0udShe1l 10.0000.178
291 一人打酱油 10.0000.178
292 奔跑的菜鸟 10.0000.177
293 FLASHARROW 10.0000.177
294 ClearCode 10.0000.177
295 WindSpeaker 10.0000.176
296 makehhh 10.0000.176
297 Kashasha 10.0000.175
298 桃花岛 10.0000.175
299 B216 10.0000.175
300 techworker 10.0000.174
301 yuzunzz 10.0000.174
302 怪盗鸭德 10.0000.174
303 S0uL'S Team 10.0000.173
304 Mole 10.0000.173
305 The Order 10.0000.172
306 Dark Daisy 10.0000.172
307 chinaH.L.B 10.0000.172
308 Qu3s7 10.0000.171
309 forx 10.0000.171
310 DarkEye 10.0000.171
311 SeeSea 10.0000.170
312 talentA 10.0000.170
313 Pandemonium 10.0000.170
314 队名叫什么好呢 10.0000.169
315 33°灰 10.0000.169
316 GCC 10.0000.169
317 c00kie 10.0000.168
318 安全盒子团队 10.0000.168
319 瓦罐汤 10.0000.168
320 Marchare 10.0000.167
321 Salvation 10.0000.167
322 Xp0int 10.0000.167
323 只是来打酱油的 10.0000.166
324 s3cer 10.0000.166
325 congcongcong 10.0000.166
326 N** 10.0000.165
327 vampire 10.0000.165
328 Sn0w0lf 10.0000.165
329 追风少年王二狗 10.0000.164
330 我们来打铁 10.0000.164
331 湘军 10.0000.164
332 Sloth 10.0000.164
333 UCCU 10.0000.163
334 axyz 10.0000.163
335 probe 10.0000.163
336 who@mI 10.0000.162
337 New_World 10.0000.162
338 306 10.0000.162
339 314 10.0000.162
340 01dDriver 10.0000.161
341 小酱油 10.0000.161
342 drops_菜鸟 10.0000.161
343 Spirit+ 10.0000.160
344 国民革命第九路军 10.0000.160
345 xXxXxaAaAa 10.0000.160
346 2049 10.0000.160
347 527 10.0000.159
348 SWAT.ME 10.0000.159
349 aegis 10.0000.159
350 10.0000.158
351 WOLFPACK 10.0000.158
352 Phoenix 10.0000.158
353 171 10.0000.158
354 hszhsz95 10.0000.157
355 QAQ 10.0000.157
356 Zonda 10.0000.157
357 f0r9etpwd 10.0000.157
358 C521 10.0000.156
359 Attack & Defence 10.0000.156
360 zzz 10.0000.156
361 肥头队 10.0000.156
362 考前冲刺 10.0000.155
363 Ensaté 10.0000.155
364 11-Digit Prime Number 10.0000.155
365 WackMC 10.0000.154
366 Sing13D0g 10.0000.154
367 str!ngs 10.0000.154
368 The DHARMA Initiative 10.0000.154
369 Hacknam Style 10.0000.154
370 Natalia 10.0000.153
371 TWN 10.0000.153
372 coldcoders 10.0000.153
373 RTFM 10.0000.153
374 DOA 10.0000.152
375 fi 10.0000.152
376 503 10.0000.152
377 SnF 10.0000.152
378 drdr 10.0000.151
379 StratumAuhuur 10.0000.151
380 codebreakers 10.0000.151
381 RainbowUnicornAttack 10.0000.151
382 n00bsider 10.0000.150
383 Rõnins 10.0000.150
384 Knightsec 10.0000.150
385 v0rt3x 10.0000.150
386 Magos 10.0000.150
387 redalert 10.0000.149
388 oneup 10.0000.149
389 0x656d68 10.0000.149
390 Glidermed 10.0000.149
391 DioStudio 10.0000.148
392 Stack 10.0000.148
393 Vim Appreciation Society 10.0000.148
394 Shady Hats 10.0000.148
395 Juicers 10.0000.148
396 coderangers 10.0000.147
397 someone 10.0000.147
398 Registered Hex Offenders 10.0000.147
399 taurus 10.0000.147
400 warma 10.0000.147
401 Jacy 10.0000.146
402 "monads" 10.0000.146
403 ckm 10.0000.146
404 HPUSec 10.0000.146
405 CAT-Security 10.0000.145
406 smack 10.0000.145
407 kall 10.0000.145
408 buscoequipo 10.0000.145
409 Ballmer cliff 10.0000.145
410 soma 10.0000.144
411 艾欧尼亚 10.0000.144
412 Crazy8 10.0000.144
413 lastbyte 10.0000.144
414 devilstep 10.0000.144
415 siny 10.0000.143
416 keywee__ 10.0000.143
417 专业打酱油 10.0000.143
418 剑三又出688披风了。。 10.0000.143
419 Yamagi.com 10.0000.143
420 Insanity 10.0000.143
421 KINdred 10.0000.142
422 我不想说啥 10.0000.142
423 0x7F 10.0000.142
424 Marlboro 10.0000.142
425 hy00un 10.0000.142
427 Null Space Labs 10.0000.141
428 netAir 10.0000.141
429 RICKY 10.0000.141
430 sonshi 10.0000.141
432 TheDogz 10.0000.140
433 hackher 10.0000.140
434 NUSGreyhats 10.0000.140
435 AopzpzJ 10.0000.140
436 ScathingEyes 10.0000.140
437 OPT 10.0000.139
438 kingdom017 10.0000.139
439 DtR 10.0000.139
440 Cole4 10.0000.139
441 bobo 10.0000.139
442 Justin Bieber 10.0000.139
443 hatisan 10.0000.138
444 Cyber_Squad 10.0000.138
447 K17 10.0000.138
449 403 10.0000.137
450 h2o 10.0000.137
451 ctf08 10.0000.137
453 MeePwn 10.0000.137
454 suou03 10.0000.137
456 teester 10.0000.136
458 0x8BadF00d 10.0000.136
459 redsky 10.0000.136
460 fun1234 10.0000.136
461 MichelCode 10.0000.135
462 Hawkins 10.0000.135
463 if_true_then 10.0000.135
464 Cafelinux 10.0000.135
465 n000b 10.0000.135
466 ZeroAccess 10.0000.135
467 marvel 10.0000.135
468 xor %rax, %rax 10.0000.134
469 deadcoder 10.0000.134
470 ####### 10.0000.134
471 KerKerYuan 10.0000.134
472 Cache_Crook 10.0000.134
473 Marlboro1 10.0000.134
474 azneye 10.0000.134
475 MarlboroOne 10.0000.133
476 mollaa 10.0000.133
477 adunna 10.0000.133
478 Free The Mallocs 10.0000.133
479 CyberOps 10.0000.133
480 Attackers 10.0000.133
481 someone1 10.0000.132
482 HIKARI 10.0000.132
483 rtmcx 10.0000.132
484 Indogo02 10.0000.132
485 team13 10.0000.132
486 has_NOTHING_todo 10.0000.132
487 loneSnowflake 10.0000.132
488 bi0s 10.0000.131
489 vimvaders 10.0000.131
490 zondaa 10.0000.131
491 bradp1tt 10.0000.131
492 ICEPINEAPPLE 10.0000.131
493 rutrack 10.0000.131
494 MojoMaster 10.0000.131
495 Plann 10.0000.131
496 3Sh4 10.0000.130
497 At Least We're Pretty 10.0000.130
498 y0nko 10.0000.130
499 Soy Sauce 10.0000.130
500 HeXA 10.0000.130
501 testers 10.0000.130
502 testers2 10.0000.130
503 NANO#212123 10.0000.129
504 Team BASH 10.0000.129
505 Und3rSt4nd 10.0000.129
506 vanhelsing 10.0000.129
507 Dokko 10.0000.129
508 jinja 10.0000.129
509 BU 10.0000.129
510 vanhelsing1 10.0000.129
511 chuck14 10.0000.128
512 crtl 10.0000.128
513 WolfPacked 10.0000.128
514 MMM 10.0000.128
515 ECX Inc. 10.0000.128
516 Playfair2k16 10.0000.128
517 f0r9et 10.0000.128
518 Udsu-ctf-first 10.0000.128
519 CbeTeam 10.0000.127
520 RPISEC 10.0000.127
521 SherlockInOurHolmes 10.0000.127
522 PDKT 10.0000.127
523 REU 10.0000.127
524 KUZUMOCHI 10.0000.127
525 555+ 10.0000.127
526 Ucorn1 10.0000.127
527 crackatoa 10.0000.126
528 M4RI0 10.0000.126
529 JohnDoe 10.0000.126
530 d4rk* 10.0000.126
531 brucel33t 10.0000.126
532 no_team_name 10.0000.126
533 yodog 10.0000.126
534 Inc 10.0000.126
535 ByteOfLatte 10.0000.125
536 EPG 10.0000.125
537 vetsin 10.0000.125
538 Templarios 10.0000.125
540 appBana 10.0000.125
541 skinsosoft 10.0000.125
542 biffsquad 10.0000.125
543 Ronald Pagan 10.0000.125
544 arkamaj 10.0000.124
545 Crimson_Agents 10.0000.124
546 iridescent 10.0000.124
547 0xdeadbeef 10.0000.124
548 uiuctf 10.0000.124
549 Renee 10.0000.124
550 Hawks 10.0000.124
551 asdf 10.0000.124
552 randomplayer 10.0000.124
553 hhhhh 10.0000.123
554 lintile 10.0000.123
555 hAIXer 10.0000.123
556 Ba Sing Sec 10.0000.123
557 DZ 10.0000.123
558 SweCopyFloppy 10.0000.123
559 0xc0ffee 10.0000.123
560 Jeramy 10.0000.123
561 GameOver 10.0000.123
562 Cuse 10.0000.122
563 moo 10.0000.122
564 d4rkc0de 10.0000.122
565 ch1nch1lla 10.0000.122
566 meloholic 10.0000.122
567 juncheol 10.0000.122
568 AiO 10.0000.122
569 AiA 10.0000.122
570 TAT 10.0000.122
571 CLAY 10.0000.122
572 DannyJay 10.0000.121
573 Ghost Sec Team 10.0000.061
574 porpeeranut 10.0000.061
575 BPlayer 10.0000.061
576 Knight_riders 10.0000.061
577 0x737973 10.0000.060
578 Sexypasta 10.0000.060
579 LoneViking 10.0000.060
580 Pes planovalgus 10.0000.060
581 ACTU 10.0000.060
582 TheKillingTime 10.0000.060
583 marsnoobz 10.0000.060
584 Karpuz 10.0000.060
585 tempo 10.0000.060
586 bobsburgers 10.0000.060
587 bdraff 10.0000.060
588 BadBurrito 10.0000.060
ktMarch 15, 2016, 4:20 p.m.

Yep, the CTF is only 3 days away and there is no CTF description here and the CTF website is not up-to-date at all.


binerddMarch 16, 2016, 9:34 a.m.

Now the updated site is online


Dor1sMarch 18, 2016, 10:03 a.m.

Registration is broken: {"msg":"invalid post param: uid","key":"uid","err":"param"}


Dor1sMarch 18, 2016, 10:16 a.m.

Cannot register even through an account at XCTF. Google translates says this at XCTF page:

Participation BCTF 2016
XCTF-Time as XCTF League standings and statistics management platform. Each race game platform independence.
Before the game at 20:00 on the 1st before registration in XCTF-Time and join a team of players can participate in the contest.
Players can view account information entry through this page. Entry information will be released before the game at 23:00 on the 1st in XCTF-Time, please be patient.
No XCTFTIME your entry information.
Please visit http://bctf.cn/ participate in the contest.
If you have questions, please mail or through sub-races IRC contact the administrator.


warchantuaMarch 23, 2016, 2:20 p.m.

Could somebody write a write-up for task "Hyper RSA / 500"?


PharisaeusMarch 24, 2016, 9:30 a.m.

@warchantua there was nothing interesting there, just very tedious and time-consuming calculations. It was a meet-in-the-middle attack. You could recover P1, P2 and Q1, Q2 from the server by sending some E (eg. 3, and 65537) values and getting D1 and D2 values for them (this you could do with https://sourceforge.net/projects/rsaconverter/). And then you had to encrypt the given plaintext single time via RSA for all possible E values (up to 9 digit numbers), and decrypt corresponding ciphertext for all D values (so you again iterate over all possible E values up to 9 digit numbers and calculate D value for it). This way you have a very long (gigabytes long...) list of single RSA encrypted plaintext and single RSA decrypted ciphertext and there should be the same row in both of them. This row gives you E1, and E2 used by the server, which you can then use to decrypt the flag.


factorealMarch 28, 2016, 2:53 a.m.

Please submit scoreboard to CTFTime, thanks