BingoCTF 2020 had a rule that asked users to refrain from playing in a crowded area which were not limited to cafes or offices.
It seemed like some of them broke the rule. As an organizer, we had a long discussion about the issue and finally decided not to disclose nicknames. However, we have decided to disclose part of their IP addresses.
The reason is that:
- BingoCTF 2020 is a small contest, and there were not many participants during the competition.
- This project intends to warn CTF cheaters that cheating detection mechanisms can become more sophisticated these days.
- Most of the participants had a short nickname, so it was easy to predict even if we mask part of their nicknames.
- We really didn't want cheaters to lose reputation and feel ashamed to the public. I hope they've learned their lessons.
3 users have played on the same IP address. (violation of the game rule)
| date | ip | team_name | flag | log |
|---|---|---|---|---|
| 2020-11-12 05:47:29 | ::ffff:128.134.203.* | [REDACTED-G] | intmagic from (No IP) | Success |
| 2020-11-12 03:48:51 | [REDACTED-B] | intmagic from (No IP) | CHEAT: same_ip: [128.134.203.*] 2 teams :: [REDACTED-B],[REDACTED-A] | |
| 2020-11-12 03:48:51 | 128.134.203.* | [REDACTED-A] | intmagic from (No IP) | Success |
| 2020-11-12 01:11:35 | 128.134.203.* | [REDACTED-B] | simple_memo from (No IP) | Success |
| 2020-11-12 00:30:58 | 128.134.203.* | [REDACTED-B] | intmagic from (No IP) | Success |
2 users have played on the same IP address. (violation of the game rule)
| date | ip | team_name | flag | log |
|---|---|---|---|---|
| 2020-11-12 04:19:19 | 220.117.200.* | [REDACTED-C] | intmagic from (No IP) | Success |
| 2020-11-12 04:19:19 | [REDACTED-C] | intmagic from (No IP) | CHEAT: same_ip: [220.117.200.*] 2 teams :: [REDACTED-D],[REDACTED-C] | |
| 2020-11-12 02:27:45 | 220.117.200.* | [REDACTED-D] | temporary from 220.117.200.* | Success |
| 2020-11-12 02:27:23 | 220.117.200.* | [REDACTED-D] | intmagic from (No IP) | Success |
Log of testing cheating detection because (i) there was no sign of direct flag trade (ii) player had a question about the challenge.
| date | ip | team_name | flag | log |
|---|---|---|---|---|
| 2020-11-12 19:04:27 | 14.63.106.* | [REDACTED-E] | whalerice from 14.63.106.* | CHEAT: flag_trade: [REDACTED-E] <-> [REDACTED-F] |