Fri, 19 Dec. 2025, 08:00 UTC — Sun, 21 Dec. 2025, 08:00 UTC 

On-line

HKCERT CTF event.

Format: Jeopardy Jeopardy

Official URL: https://ctf.hkcert.org/

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

Future weight: 10.31 

Rating weight: 83.21 

Event organizers 

HKCERT Capture The Flag 2025,” organised by the Hong Kong Computer Emergency Response Team Coordination Centre (HKCERT), the Hong Kong Productivity Council (HKPC) and the Digital Policy Office of HKSAR, is now in its sixth edition. It is one of the largest cybersecurity competitions in Hong
Kong, featuring four categories: Secondary School, Tertiary, Open, and International.

This year there will be an online Jeopardy CTF (qualifying round) and a physical CTF with offensive and defensive challenges (Final round).

Please register at below HKCERT CTF website
https://ctf.hkcert.org
(Registration deadline: 14 Dec 2025)

Prizes

There are 2 rounds of the competition -> qualifying round and final round.

The top 5 teams of each category of the qualifying round will advance to the onsite final round at Hong Kong.

The prize for the winners in the final round are as below

Gold: HKD 16,000 ( Per Team )
Silver: HKD 13,000 ( Per Team )
Bronze: HKD 11,000 ( Per Team )

Please register at below HKCERT CTF website
https://ctf.hkcert.org
(Registration deadline: 14 Dec 2025)

Scoreboard

567 teams total

PlaceTeamCTF pointsRating points
1 Project Sekai 11420.000166.420
2 ChinaTelecom CyberSecurity Team 11403.000124.691
3 W&M 11386.000110.699
4 SU 11311.000103.218
5 Azure Assassin Alliance 10763.00095.065
6 Lilac 10545.00090.703
7 UIT-Wanna.W1n 10454.00088.059
8 天枢 10450.00086.544
9 BunkyoWesterns 9801.00080.659
10 Bocil_Roblox 9136.00074.889
11 waterdrop 8934.00072.661
12 destiny 8855.00071.455
13 None 8425.00067.788
14 Redbud 8295.00066.384
15 Xrganizers 8040.00064.130
16 0ops 8011.00063.571
17 Polaris 7895.00062.420
18 Students Taking Flags United 7869.00061.959
19 jwbs 7797.00061.191
20 Redback Crawlers Ensemble 7727.00060.462
21 0xFFF 7386.00057.779
22 IRESDTU 7319.00057.111
23 Black Bauhinia 7155.00055.752
24 NuttyShell 6914.00053.845
25 KUNLUN 6751.00052.518
26 DrovoCR4.sh 6603.00051.312
27 The Few Chosen 6542.00050.749
28 ARESx 6032.00046.923
29 Mini-Venom 5867.00045.618
30 Elephant_can_fly 5817.00045.158
31 Capture The Failures 5796.00044.916
32 NuttyShell Purple 5732.00044.366
33 Icebird 5637.00043.595
34 WE AIN'T SHAR 5618.00043.382
35 bluebud 5500.00042.452
36 0psu3 5496.00042.357
37 S™ 5433.00041.836
38 Gimel 5204.00040.108
39 Maple_Leaves 5194.00039.979
40 Flagaholic 5135.00039.496
41 TorchW00d 4984.00038.345
42 NuttyShell Red 4869.00037.458
43 EICS1 4690.00036.108
44 Happy_Birthday 4634.00035.656
45 Red Hare 4617.00035.490
46 What() 4509.00034.663
47 MEDUSA 4394.00033.787
48 H4ckForFun 4314.00033.167
49 Novaxis 4299.00033.022
50 shsetsSec 4298.00032.981
51 Ph0ny 4263.00032.693
52 glzjinsbot 4227.00032.400
53 AUTOEXEC.BAT 4211.00032.253
54 hello world has been taken 4154.00031.808
55 BIT 4092.00031.329
56 T0003 (2025 Reunion) @ TWY's Temple 4062.00031.083
57 I1689 3995.00030.569
58 CRYPT1C 3938.00030.128
59 EDRI-CSG 3883.00029.703
60 The Ants 3811.00029.155
61 Kheshig 3725.00028.506
62 nature 3681.00028.163
63 S0166 - Tin Ka Ping Secondary School 3639.00027.836
64 JRHM 3631.00027.757
65 2boysOnePwn 3546.00027.118
66 TheRomanXpl0it 3424.00026.209
67 ChiLL Chain 3420.00026.161
68 n0ng1eibur4n9 3409.00026.063
69 Nepnep 3375.00025.797
70 f4n_g4mm4 3295.00025.197
71 S0551 - Fanling Kau Yan College 3260.00024.925
72 thehackerscrew 3095.00023.707
73 翼安先锋 3004.00023.028
74 Night Heron 2967.00022.743
75 nuttyshell blue 2947.00022.582
76 NEURON 2945.00022.553
77 思极ADsec 2944.00022.532
78 SGAD 2944.00022.518
80 FYC_is_GAY 2916.00022.287
81 S0020 - Sing Yin Secondary School 2845.00021.757
82 chill guys 2844.00021.737
83 Cyb3r_Star 2841.00021.703
84 ech0 2838.00021.669
85 S0183 - St. Louis School 2827.00021.577
86 Child Players 2796.00021.340
87 PwnStars✨ 2790.00021.285
88 chinjee4590672 2753.00021.005
89 Eenzege Star 2717.00020.732
90 ECNU 2704.00020.627
91 SCTAAAAAX 2653.00020.245
92 S0192 - Diocesan Boys' School 2648.00020.199
93 Win or Mushroom 2618.00019.970
94 S0422 - Chiu Chow Association Secondary School 2536.00019.363
95 Morning_ST4R 2528.00019.296
96 NTU@SG B4nyan Hax0rs 2522.00019.243
97 T1009 - HKUST 2500.00019.074
98 mimicats 2488.00018.977
99 Birkenwald 2457.00018.743
100 BitStorm 2455.00018.720
101 S0098 - Yan Chai Hospital Law Chan Chor Si College 2413.00018.406
102 Win+X 2399.00018.296
103 NuttyShell Alpha 2369.00018.069
104 S0539 - SHATIN PUI YING COLLEGE 2336.00017.821
105 S0217 - Pui Kiu College 2293.00017.500
106 Feebas✨ 2287.00017.449
107 Sombra hacked the flag! How can we win???????😵‍💫 2265.00017.281
108 hackeresan 2255.00017.201
109 T0992 - CityU, CUHK, PolyU 2233.00017.034
110 Cha_god_molmol 2181.00016.648
111 4ur0ra_two 2155.00016.452
112 or4nge 2094.00016.001
113 9527-Molecular Laboratory 2084.00015.921
114 kz 2066.00015.783
115 S0374 - Tuen Mun Catholic Secondary School 2021.00015.449
116 CMCC ‌Iron Eagle 1975.00015.108
117 NISA 1972.00015.080
118 ITSEC ASIA 1939.00014.833
119 flux 1887.00014.449
120 S0177 - fanling lutheran secondary school 1878.00014.377
121 geek_sec 1877.00014.364
122 gaslighting 1860.00014.235
123 S0201 - St. Joseph's College 1845.00014.120
124 MaimaiDX 1836.00014.049
125 fa1ry 1780.00013.635
126 PwnHub 1775.00013.594
127 CIBgogogo 1764.00013.508
128 CityYuHK Ma Liu Shui 1720.00013.183
129 BeFunLab 1719.00013.170
130 HK MegaKnight 1701.00013.034
131 I want to go to HK 1687.00012.927
132 不说包的,要说志在必得 1686.00012.915
133 Who_has_Flag 1651.00012.655
134 Aurora 1648.00012.629
135 SSSec235 1646.00012.610
136 HachikeMiaoUsagi 1577.00012.102
137 Losangle Lakers 1535.00011.792
138 Lavender 1533.00011.773
139 axiom 1513.00011.623
140 My4nM4r 1510.00011.597
141 GTFF 1492.00011.461
142 I1635 1483.00011.392
143 YunSee 1479.00011.358
144 爱吃西红柿 1472.00011.303
145 krauq 1469.00011.277
146 DontByteUs 1464.00011.237
147 I1022 1451.00011.139
148 EISBanana 1443.00011.076
149 Garda Elite Penjaga Waifu 1425.00010.941
150 KFC 1422.00010.916
151 BD_CIRT_Dr@g0nS 1418.00010.883
152 对勾对z 1413.00010.843
153 S0475 - Lai King Catholic Secondary School 1409.00010.810
154 Geek_Team 1404.00010.770
155 GWZ 1396.00010.709
156 Dr0g3n_H3x 1394.00010.691
157 Guinsoo's Rageblade 1381.00010.592
158 bruhopen 1367.00010.487
159 S0506 - St. Francis Xavier's School, T.W. 1366.00010.476
160 !Not Chill Player 1363.00010.451
161 DROP TABLE teams;-- 1361.00010.434
162 V0idNu1L 1287.0009.891
163 CtrlC_Masters 1270.0009.764
164 666-Meow Team Messes Up 1221.0009.404
166 MetaGriPwn 1213.0009.340
167 Courage Makes Vision Wider 1212.0009.329
168 I1270 1205.0009.275
169 dozer 1203.0009.258
171 老蔡才是MVP 1190.0009.157
172 Geek_OnePanda 1182.0009.096
173 NuttyShell Sigma 1172.0009.021
174 P014r15 1168.0008.989
175 skill_issue 1149.0008.847
176 _F@n 1142.0008.794
177 S0499 - Sing Yin Secondary School 1122.0008.645
178 T0977 - CUHK 1122.0008.643
179 Me1l1der_S3cr3t 1121.0008.633
180 TRIODE_IS_GOD 1118.0008.608
181 Drained By Work No Time CTF 1101.0008.482
182 T0085 - THEi 1092.0008.414
183 T1024 - Kali 1048.0008.091
184 T1016 - CityU 1037.0008.008
185 Hmmmm 1037.0008.006
186 O0948 1036.0007.996
187 I0621 1030.0007.950
188 Belma's Goat Factory 1026.0007.918
189 S0537 - SHATIN PUI YING COLLEGE 1024.0007.901
190 S0390 - Wah Yan College, Kowloon 1023.0007.892
191 Flag? When did you come? 1019.0007.860
192 CyberSquasher 1017.0007.844
193 Skibidi Sigmas 1016.0007.834
194 The clique 1006.0007.759
195 T0783 - CUHK 995.0007.677
196 LingDunSec 975.0007.529
197 S0486 - CARMEL SECONDARY SCHOOL 968.0007.476
198 S0473 - Kowloon True Light School 934.0007.226
199 BlastFL4G 926.0007.165
200 w_x_w 924.0007.149
201 看看题 916.0007.088
202 d0zer 915.0007.079
203 S0511 - Sing Yin Secondary School 899.0006.960
204 tmp 879.0006.813
205 S0178 - Hong Kong Management Association David Li Kwok Po College 876.0006.789
206 S0392 - Wah Yan College, Kowloon 875.0006.779
207 SSSec798 874.0006.770
208 崩铁启动 870.0006.739
209 d7po 867.0006.715
210 further_ocean-complex 850.0006.590
211 ooffline 838.0006.500
212 S0445 - CARMEL SECONDARY SCHOOL 833.0006.462
213 Shell01-Team 828.0006.424
214 OTNOPAY 821.0006.371
215 ThisIsUnsafe 808.0006.274
216 Take_It_Easy 803.0006.236
217 pololololobao 801.0006.220
218 星光成炬 800.0006.211
219 S0436 - 仁愛堂田家炳中學 789.0006.129
220 朝花夕拾杯中酒 782.0006.076
221 SParK 772.0006.002
222 AXHU·xuan_shu 769.0005.978
223 ICEDTEA 754.0005.867
224 HuoGuoEr 754.0005.865
225 Icy G 753.0005.856
226 S0459 - Kowloon True Light School 753.0005.855
227 BangDream It's MyGo!!!!! 751.0005.839
228 16j 750.0005.830
229 Ciallo~(∠・ω< ) 734.0005.712
230 S0472 - Kowloon True Light School 725.0005.644
231 T0860 - CUHK 722.0005.621
232 Evi1_King'5_True_Eye 713.0005.554
233 S0465 - Kowloon True Light School 705.0005.494
234 S0466 - Kowloon True Light School 705.0005.492
235 S0467 - Kowloon True Light School 705.0005.491
236 S0468 - Kowloon True Light School 705.0005.489
237 S0469 - Kowloon True Light School 705.0005.488
238 S0470 - Kowloon True Light School 705.0005.486
239 S0471 - Kowloon True Light School 705.0005.485
240 先签到 703.0005.469
241 MaLiuShui 698.0005.431
242 T0294 - HKU 695.0005.408
243 Marcio Herobrine 692.0005.385
244 S0540 - SHATIN PUI YING COLLEGE 671.0005.230
245 BLACKWING 🐦‍⬛ 670.0005.221
246 T0089 - HKCT 670.0005.220
247 wuliwa_aeiou_breakingbad_mmk 664.0005.175
248 0 661.0005.152
249 I0186 649.0005.063
250 S0409 - The Chinese Foundation Secondary School 643.0005.018
252 New Type 638.0004.979
253 kn0ck 636.0004.963
254 ggstudy_ddup 634.0004.947
255 Silly Security 634.0004.946
256 S0104 - SKH Lam Woo Memorial Secondary School 623.0004.864
257 pikachu 621.0004.849
258 H3110_W0r1d 599.0004.687
259 Hex404 591.0004.628
260 We_Are_CTFMan 589.0004.612
261 S0529 - Diocesan Girls' School 587.0004.596
262 YuFeng Lab 584.0004.573
263 I0093 577.0004.521
264 Daily Dreaming Coders 575.0004.505
265 WAHAHA 566.0004.438
266 TechCERT_Spark 565.0004.430
267 Not-So-FantasticFour 565.0004.428
268 HeapUnderflow 557.0004.369
269 CUHK0x 557.0004.368
270 Roastbird 555.0004.352
271 下北澤會員制餐廳 555.0004.351
272 SSSec777 553.0004.335
273 0O3032400 526.0004.137
274 Ginkgo 525.0004.129
275 XiliuDRI 512.0004.033
276 sub::version 509.0004.010
277 gugugaga 503.0003.965
278 NovaVanguard 496.0003.913
279 Sigmas 496.0003.912
280 脆骨 495.0003.904
281 World's end BLACKBOX 492.0003.881
282 MEOW MEOW MEOW MEOW MEOW 490.0003.865
283 Flag Heist 490.0003.864
284 COMPASS 487.0003.841
285 ING FLAGS 480.0003.789
286 XSG 479.0003.781
287 wwwaaa 478.0003.773
288 Greenhorn_team 476.0003.757
289 Onicoders-UciTeam 473.0003.734
290 云顶刺客 472.0003.726
291 WJWG 461.0003.645
292 827114-Saber 450.0003.564
293 C@tt 446.0003.534
294 S0519 - St. Joseph's College 442.0003.504
295 Sungone 441.0003.495
296 T0001-CT Champ 436.0003.458
297 Origin 435.0003.450
298 OnePanda 433.0003.434
299 T0177 - HKCT 425.0003.375
300 Ph1ny 424.0003.367
301 S0414 - H.K. & Kowloon Kaifong Women's Association Sun Fong Chung College 417.0003.315
302 strong 416.0003.307
303 WannaCry 414.0003.291
304 ss0t 407.0003.239
305 wge 407.0003.238
306 Thoth-Moon 397.0003.165
307 SeaFourCYME 397.0003.164
308 看看看题 395.0003.148
309 NCCU_MPIS 390.0003.111
310 SRisFun3 387.0003.088
311 sign 384.0003.066
312 M00n1ight 381.0003.043
313 9003 376.0003.006
314 yuppie 376.0003.005
315 TableFlippingU 374.0002.989
316 MoMaGaGai_1234 374.0002.988
317 DragonShell 372.0002.973
318 We_Are_Fczy 370.0002.958
319 S0518 - Man Kwan QualiEd College 363.0002.906
320 Flag Snatch And Bolt 360.0002.883
321 Ch4ng3rs 359.0002.875
322 livitr 351.0002.816
323 Ifahssilooc 351.0002.815
324 see2run 350.0002.807
325 O0767 348.0002.792
326 interstellar 346.0002.776
327 #ffff00 339.0002.725
328 hhhhh 338.0002.716
329 S0263 - The Chinese Foundation Secondary School 327.0002.636
330 I1550 321.0002.591
331 we know nothing 318.0002.568
332 S0323 - Buddhist Sin Tak College 318.0002.568
333 辣子鸡 318.0002.567
334 flyingpig 315.0002.544
335 grey 305.0002.471
336 S0439 - Yan Oi Tong Tin Ka Ping Secondary School 305.0002.470
337 Kumar Slayers 298.0002.418
338 two 298.0002.418
339 Team Duck 298.0002.417
340 Lapse_Risk_Team 296.0002.401
341 T1029 - CityU 295.0002.393
342 [NULL] 295.0002.393
343 得闲饮茶 295.0002.392
344 T0238 - CityU 295.0002.391
345 Tech Potato 295.0002.391
346 S0504 - Queen Elizabeth School Old Students' Association Secondary School 291.0002.361
347 Golden_Snitch 290.0002.353
348 Overf1ow 275.0002.243
349 Fenice 275.0002.242
350 HexBorne 274.0002.234
351 CatFlag 273.0002.226
352 Machine-in-the-Middle School Dropouts 273.0002.226
353 ctf+86 272.0002.218
354 LoveFromMimic 272.0002.217
355 npc 271.0002.209
356 NighHAX 269.0002.194
357 R_OxPloit3rs 269.0002.193
358 Binary Bandits 266.0002.171
359 我想要上床下桌 265.0002.163
360 hackOverflow 265.0002.162
361 Sevenstars 265.0002.161
362 I need get flag to hit on her. 265.0002.161
363 S0501 - Po Leung Kuk Celine Ho Yam Tong College 261.0002.131
364 TC_Anons 261.0002.130
365 m1xu3 259.0002.115
366 TeamSix - KuangChan 259.0002.115
367 DNA001-Neon Sprawl DNA Unit 259.0002.114
368 NF_CTF 257.0002.099
369 S0533 - LAM TAI FAI COLLEGE 257.0002.098
370 1or1 250.0002.046
371 BlueWhale 250.0002.046
372 ctrl 249.0002.038
373 0xC3500 249.0002.037
374 O10086-失败的Man 249.0002.037
375 born to exploit, forced to study 246.0002.014
376 I1567 245.0002.006
377 Red Elephant 245.0002.006
378 PH1niX IGNITE! 230.0001.896
379 a32x86 227.0001.874
380 Stellar Convergence 227.0001.873
381 STAR_CTF 226.0001.865
382 NoMoreBilewater 226.0001.865
383 Victims of Authentic GEMC 226.0001.864
384 CodeBloodedSibs 226.0001.863
385 B14ck 1ce 226.0001.863
386 jhws_N7s3c 225.0001.855
387 Boldeas 224.0001.847
388 Burger King's Tea 223.0001.839
389 Big_shet 220.0001.817
390 Sensei 217.0001.794
391 10086 - ZERO 207.0001.721
392 ANaNSI 202.0001.684
393 桂花战队 202.0001.684
394 Would you like to define the team name? 201.0001.676
395 D0710-Come and stand as punishment 200.0001.668
396 Koi 199.0001.660
397 T0983 - HKU 199.0001.660
398 QJWD 199.0001.659
399 Budwisher 199.0001.659
400 01pr0m1se 199.0001.658
401 ThreeKings 199.0001.657
402 只想摸鱼不想打CTF 199.0001.657
403 TryCTF 198.0001.649
404 S0375 - Tuen Mun Catholic Secondary School 198.0001.649
405 你说的都对 197.0001.641
406 Why @m 1 h3r3 197.0001.640
407 QF.Team 196.0001.633
408 give me a flag 180.0001.515
409 ShibaSecure#1 180.0001.515
410 flag 180.0001.514
411 TXSec 178.0001.499
412 没有你 178.0001.499
413 Dividing_Line 178.0001.498
414 S0550 - Carmel Secondary School 176.0001.483
415 f1aggingbehind 176.0001.483
416 O1001 176.0001.482
417 S0330 - Youth College (Kwai Fong) 176.0001.482
418 Zero Domain Security 176.0001.481
419 T0373 - CUHK 176.0001.481
420 S0391 - Wah Yan College, Kowloon 176.0001.481
421 204 176.0001.480
422 S0118 - The YWCA Hioe Tjo Yoeng College 175.0001.472
423 Ctfctf666 167.0001.414
424 GDUFS_Hacker_Team 161.0001.369
425 OneSword 161.0001.369
426 0x3b 161.0001.368
427 elif 161.0001.368
428 ByteGuardians 160.0001.360
429 ctfgc 158.0001.345
430 The_knower 154.0001.316
431 Netr0Guardian 150.0001.286
432 Gome 148.0001.271
433 Evan 148.0001.271
434 Crypto_Catchers 142.0001.226
435 T02330 - EscapeFromHKCC 138.0001.197
436 又爆零了 138.0001.196
437 YCWC 138.0001.196
438 no_name 136.0001.181
439 kaajak 136.0001.180
440 OneHalf 134.0001.165
441 we_tried 134.0001.165
442 00008 – HK-noob 134.0001.165
443 S1ck Six s3v3n 134.0001.164
444 C3sec 134.0001.164
445 SS1 132.0001.149
446 hubu_zero 132.0001.148
447 BungkusNet 132.0001.148
448 Try Again 132.0001.148
449 What_Flag 132.0001.147
450 GZ_leader 130.0001.132
451 JSDLXX 130.0001.132
452 STRUGLERS 130.0001.131
453 FlagHuntersX 130.0001.131
454 horti_CC 130.0001.131
455 Over Thinking 130.0001.130
456 Cyber Ninjas 130.0001.130
457 Onepad 128.0001.115
458 I0054 128.0001.114
459 Hangar18 117.0001.034
460 Sign in and go straight to sleep team 113.0001.004
461 Error Sheet 113.0001.004
462 ykx 112.0000.996
463 I1286-eat_orange 112.0000.996
464 CFSC WannaSafe 112.0000.995
465 IWANTMYCRUSHTALKSTOME 110.0000.980
466 I0737 110.0000.980
467 Bro has useful info 110.0000.980
468 2587 107.0000.957
469 S0460 - Christ College 104.0000.935
470 Sunshine Earth Kindergarten 96.0000.877
471 Crychic 94.0000.862
472 CeSaaiKei 94.0000.861
473 aka3001 92.0000.846
474 T0975 - HKUST 92.0000.846
475 ing 92.0000.846
476 NgHoYin 90.0000.831
477 helloWorld 88.0000.816
478 t3rm1n4t0rs 88.0000.815
479 We_Are_Rebirth 88.0000.815
480 h4ck 88.0000.815
481 SoybeanSec 88.0000.814
482 S0306 - Pui Shing Catholic Secondary School 86.0000.799
483 S0309 - Pui Shing Catholic Secondary School 86.0000.799
484 CS 86.0000.799
485 Saleem & Yazan 86.0000.798
486 ddw 86.0000.798
487 tothemoon 86.0000.797
488 TKOffice366 84.0000.783
489 T0579 - THEi 84.0000.782
490 I0285 84.0000.782
491 NoFlagForMice 84.0000.782
492 My Friends Dumped Me 84.0000.781
493 NOV 84.0000.781
494 mettaur 84.0000.780
495 PAPA 84.0000.780
496 S0320 - N.T. Heung Yee Kuk Yuen Long District Secondary School 84.0000.780
497 fzhshzh 84.0000.779
498 I0891 84.0000.779
499 ABBCCC 84.0000.779
500 S0372 - Tuen Mun Catholic Secondary School 84.0000.778
501 S0545 - HKICC Lee Shau Kee School of Creativity 84.0000.778
502 MW2025 84.0000.778
503 lantianbaiyun 84.0000.777
504 AngryBird 82.0000.763
505 undugketchup 82.0000.762
506 JiaSu_CTF 82.0000.762
507 Ciallo-Ciallo 82.0000.762
508 SEE 82.0000.761
509 R Square 72.0000.688
510 Imfly_Team 69.0000.666
511 CPC 69.0000.666
512 zzzctf 69.0000.665
513 S0503 - Diocesan Boys' School 66.0000.643
514 Geez 58.0000.584
515 S0186 - St. Louis School 58.0000.584
516 S0262 - The Chinese Foundation Secondary School 58.0000.584
517 S0388 - St. Joseph's College 58.0000.584
518 Slothy 58.0000.583
519 Just_For_Fun 58.0000.583
520 Jade-3952 58.0000.583
521 CTF_FOREVER 50.0000.524
522 smallZ 50.0000.524
523 S0164 - CCC KEI TO SECONDARY SCHOOL 48.0000.509
524 xxd 48.0000.509
525 0DIN - GHOST 48.0000.508
526 CTF_New 46.0000.493
527 S0431 - CCC Ming Yin College 46.0000.493
528 ztDName 46.0000.493
529 Tomato Ketchup 46.0000.492
530 Smaug 46.0000.492
531 Open Team 666 46.0000.492
532 Cant_find_the_flag 46.0000.492
534 ca 46.0000.491
535 Skyxploit 44.0000.476
536 Amoda 44.0000.476
537 KyuRei 44.0000.476
538 L0vE 44.0000.475
539 MorganaTrace 44.0000.475
541 Nobody777 38.0000.431
542 root 38.0000.430
543 bobo 38.0000.430
544 S0449 - GCC&ITKD Lau Pak Lok Secondary School 38.0000.430
545 _h4ck 38.0000.430
546 Zero_Day_Heroes 38.0000.429
547 Lunar_Scale 38.0000.429
548 Underdog 38.0000.429
549 alug 38.0000.428
550 T0195 - HKU 38.0000.428
551 LuanDaYiTong 38.0000.428
552 TENEB 38.0000.428
553 suspect 38.0000.427
554 Xin_Hao_Bie_Gao 38.0000.427
555 Outsiders 38.0000.427
556 O0585 38.0000.427
557 Get_flags 38.0000.426
558 Qiu Qiu you Give me Flag 38.0000.426
559 zueler 38.0000.426
560 I0699 38.0000.425
561 I1810 38.0000.425
562 murk1s 38.0000.425
563 Ciallo 38.0000.425
564 S0402 - Ying Wa College 38.0000.424
565 S0403 - Ying Wa College 38.0000.424
566 S0463 - Christ College 38.0000.424
567 Gaetano's friends 38.0000.212
568 S0151 - Queen's College Old Boys' Association Secondary School 20.0000.146
569 CTF_Hunter 20.0000.146
570 have a try 20.0000.146
571 长歌 20.0000.146
572 AI is love 20.0000.146
573 S0428 - Clementi Secondary School 20.0000.145
ankupatel279Nov. 18, 2025, 7:28 a.m.

i am bug bounty hunter


TheHakkamanDec. 21, 2025, 8:24 a.m.

Hi guys, I understand that the quality of the CTF this CTF is kind of, uh, have a lot of improvement space,
but I would like to remind you that your weight voting would affect the weighting next time (aka next organizer).
Although I can't vote so I have to remind everyone here.

But personally I would still vote 1/100 if I can vote :)


cannotpupilDec. 21, 2025, 9:43 a.m.

This shoddy CTF is in no way representative of Hong Kong's CTF scene; please look towards previous iterations and other competitions in the area!


SISUBENYDec. 21, 2025, 10:20 a.m.

hkcert please do better???


sxsxnoDec. 21, 2025, 10:52 a.m.

delay no more


UmmItDec. 21, 2025, 11:48 a.m.

Why is the CTF scheduled during exam time? This is really poor planning. Most students are unable to perform at their best or even can't attend.

Plus, why has the admin always disappeared?

It's very disappointing.
1/10.


pickaxe828Dec. 21, 2025, 12:43 p.m.

Tbh, this is quite an unprofessional competition.

Regex are not provided.
While little to no hints are provided.

There are huge space for improvements.
Still, I'm very glad to see CTFs being held locally in Hong Kong!


djaiowdDec. 22, 2025, 7:22 a.m.

Among the five advancing teams in the international group, four are from Mainland China, and the company behind these poor-quality challenges is also from Mainland China... This inevitably leads to many unfavorable associations... Hopefully, next year we can see challenges created by Hong Kong CTFers themselves.


siunamDec. 24, 2025, 10:51 a.m.

This iteration of HKCERT CTF is not co-organized by Black Bauhinia. I'm very disappointed with this year co-organizer. There are so many problems in this year:
1. First/second/third blood bonus points
It's unfair to international players. If the CTF is strictly limited to local players only, I think it's still somewhat fine. However, you have to consider that HKCERT CTF has an international category, meaning that not all players (especially international players) can get first blooded when the challenges are released. In some teams, the time of the first wave is at 2 a.m. on their side. Like, what, are you expecting that they can stay awake just to get first blood bonus points?

2. Challenge waves release schedule
The wave schedule is not mentioned in anywhere before and even after the CTF has started. Some waves' schedule were announced only after players urging the co-organizer to do so. Also, the schedules were only announced through the official Discord server. Dude, your platform has a freaking notification system, is that just for decoration like a Christmas tree? I have to keep going back and forth with my team's server and the official Discord server just to see if there's any new waves, so I can get first blood bonus points in time.

Not only that, some players also complained about there's too many waves and challenges. Here's the direct quote from the player:
"There are too many challenges, and too many waves. I mean, if each chal is very hard thats ok, but if every chal gets tons of solves then I had to stay in front of my computer for like 30 fucking hours. Thats a torture. And also because of that ppl are winning because of blood's bonus (chals are relatively easy), so I just had to work when EVERY wave got started. I had to get up at 9 at weekend. And not to mention some challenges suck (sorry!). [...]"

3. Guessy challenges
Many challenges were just straight up guessing. There are so many of them that I can't even have the time to list them here.

4. Challenges reuse
I don't know if this is a Chinese CTF "culture" or what, some challenges are copied from other CTFs, some didn't even modify a single line of code. Example:
- web/nettool is reused from Mimic (Qiangwang) 2025 finals web/wuwa (Only the final SSRF part is different. The rest is the same)
- rev/easydriver is a direct copy from NepCTF2025 rev/XSafe (Writeup: https://tkazer.github.io/2025/07/31/NepCTF2025-XSafe/)
- crypto/ec-fun is reused from hxp 38C3 CTF crypto/alcoholic_variety (Writeup: https://hxp.io/blog/110/hxp-38C3-CTF-alcoholic_variety-writeup/)
and more...

Please, for the love of God, HKCERT, please bring back Black Bauhinia as a co-organizer in future iteration.


SISUBENYDec. 24, 2025, 11:08 a.m.

btw i hate findkey X:( so guessy


xia0Dec. 29, 2025, 5:07 p.m.

Black Bauhinia should return. This year’s HKCERT CTF is bullshit.

- Guessy challenges. I cannot list every example here, but if you participated, you likely know exactly what I mean, especially in Misc.

- Stealing challenges from other CTFs. Some reviewers have already raised this concern. Additionally, it also appears that other challenges were obtained through irresponsible organizer bought from authors of certain beginner level event, which explains why the overall quality was highly uneven.

- Suspected leakage of challenge and/or rule violations during the contest. The involvement of an irresponsible Chinese organizer, irresponsible Chinese challenge authors, and the strange final standings, where certain teams with no prior comparable results on CTFtime placed near the top, creates substantial grounds for concern. This is not just conjecture. There exists evidence.

I have no idea why Black Bauhinia did not organize the event this year, perhaps for reasons that are well known. However, if Hong Kong wishes to save reputation of this CTF or HKCERT HKPC or whatever, it is clear what needs to be done.

In addition, I want to say this to those who compete in the Secondary School category that genuinely care about CTFs: this event was absolutely shit, and you do not need to feel upset about your result here.

Your performance in a single, poorly run event does not define your ability or your potential. The CTF community offers countless well organized, high quality competitions that are worth your time and effort, and where you can grow and be evaluated fairly.


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