RingZer0 Team Online CTF
RingZer0 Team's online CTF offers you tons of challenges designed to test and improve your hacking skills through hacking challenges. Register and get a flag for every challenge.
The RingZer0 Team Online CTF is now proudly hosted by NorthSec.
Challenges
Currently more than 300 challenges are available over 15 categories. Have fun resolving them.
Register
Your first time here? First step register an account, that way you will be able to login and start solving challenges.
Want to become certified RCEH?
Super simple: get at least 70% of the total points. With this certification, you will be able to buy a RCEH token that will be available on the shop. The RingZer0 Certified Elite Hacker (RCEH) certification is a highly technical certification. Anyone holding the RCEH title is a highly skilled hacker.
Not so simple anymore. The requirement is the same where you need at least 70% of the total points (which is 1336 points at the moment). However, once you get above that amount, you must ask the team of volunteers for the title and prove that you got the points, not AI.
Once you get your RCEH title you can proudly use the certified logo 
and show to the rest of the world that you successfully managed to solve several hacking challenges on the RingZer0 CTF.
Scoreboard - 54312 players |
| Position | Username | Points | Gold | Last Validation | Special Mention |
|---|---|---|---|---|---|
| 401 |
 |
185 | 2 | 2020-05-07 15:08:10 | |
| 402 |
 |
185 | 0 | 2025-06-08 09:39:31 | |
| 403 |
 |
185 | 0 | 2017-05-17 21:37:37 | |
| 404 |
 |
184 | 34 | 2025-10-28 14:52:27 | |
| 405 |
 |
183 | 30 | 2019-07-22 11:34:35 | |
| 406 |
|
183 | 0 | 2020-10-22 13:02:22 | |
| 407 |
 |
183 | 0 | 2017-08-29 10:49:03 | |
| 408 |
|
182 | 0 | 2025-05-13 20:41:58 | |
| 409 |
|
182 | 0 | 2023-06-03 23:00:00 | |
| 410 |
|
181 | 9 | 2021-04-10 07:45:02 | |
| 411 |
 |
181 | 0 | 2025-07-02 12:29:21 | |
| 412 |
|
181 | 0 | 2023-07-10 23:10:12 | |
| 413 |
 |
181 | 0 | 2016-05-15 06:45:27 | |
| 414 |
|
180 | 0 | 2025-10-10 12:04:11 | |
| 415 |
|
180 | 0 | 2024-03-25 13:19:26 | |
| 416 |
|
180 | 0 | 2021-01-21 12:47:55 | |
| 417 |
 |
180 | 0 | 2017-06-06 19:44:54 | |
| 418 |
|
179 | 70 | 2026-05-21 13:45:36 | |
| 419 |
 |
179 | 2 | 2025-06-09 16:28:34 | |
| 420 |
|
179 | 0 | 2026-03-31 06:53:56 | |
| 421 |
|
179 | 0 | 2025-07-02 07:56:01 | |
| 422 |
|
179 | 0 | 2022-08-04 05:53:18 | |
| 423 |
|
179 | 0 | 2020-11-17 23:38:12 | |
| 424 |
 |
179 | 0 | 2017-10-11 20:26:26 | |
| 425 |
|
178 | 55 | 2022-10-10 03:19:21 | |
| 426 |
 |
178 | 3 | 2020-03-26 17:28:25 | |
| 427 |
 |
178 | 0 | 2020-07-15 20:31:25 | |
| 428 |
|
177 | 0 | 2025-01-09 17:04:01 | |
| 429 |
 |
176 | 16 | 2021-05-02 10:01:09 | |
| 430 |
|
176 | 1 | 2018-06-15 22:57:30 | |
| 431 |
 |
176 | 0 | 2020-12-23 00:07:33 | |
| 432 |
 |
176 | 0 | 2020-04-30 09:06:29 | |
| 433 |
 |
175 | 0 | 2017-07-18 08:45:40 | |
| 434 |
|
174 | 21 | 2014-05-10 18:35:22 | |
| 435 |
 |
174 | 3 | 2019-02-01 19:51:14 | |
| 436 |
|
174 | 0 | 2023-10-23 11:51:48 | |
| 437 |
 |
174 | 0 | 2021-02-09 08:33:22 | |
| 438 |
|
174 | 0 | 2020-10-19 10:08:24 | |
| 439 |
 |
174 | 0 | 2018-10-06 12:57:10 | |
| 440 |
|
174 | 0 | 2017-08-30 03:10:54 | |
| 441 |
|
173 | 18 | 2018-08-15 04:13:23 | |
| 442 |
|
173 | 5 | 2024-06-08 10:22:24 | |
| 443 |
|
173 | 5 | 2018-08-17 13:32:57 | |
| 444 |
|
173 | 0 | 2021-08-22 05:34:33 | |
| 445 |
|
172 | 60 | 2016-08-09 01:53:51 | |
| 446 |
|
172 | 28 | 2016-08-31 20:43:20 | |
| 447 |
|
172 | 1 | 2025-10-13 15:02:19 | |
| 448 |
|
172 | 0 | 2025-07-02 12:50:46 | |
| 449 |
|
172 | 0 | 2021-03-27 05:23:35 | |
| 450 |
|
172 | 0 | 2020-10-18 04:06:17 |
Search by username
Latest challenges validations
| Last validation | Challenge | User who solved it |
|---|---|---|
| 2026-06-16 05:01:34 | TotalSecure Message Encrypter V2 | ytbjplh |
| 2026-06-16 04:31:10 | Most Secure Crypto Algo | ether123 |
| 2026-06-16 04:11:39 | Valid key required | ether123 |
| 2026-06-16 03:22:06 | Most basic SQLi pattern. | retgfrdfgsbvfds |
| 2026-06-16 03:20:06 | Why not? | ether123 |
| 2026-06-16 03:18:58 | Then obfuscation is more secure | ether123 |
| 2026-06-16 03:13:22 | Hashing is more secure | ether123 |
| 2026-06-16 03:07:52 | Client side validation is bad! | ether123 |
| 2026-06-16 02:50:10 | Martian message part 2 | ether123 |
| 2026-06-16 02:48:36 | Fashion Victim | ether123 |
The latest write-up with special mention
The latest challenges added
| Challenge | Points | Category |
|---|---|---|
| Renewable Energy Mobility (REM) (7/7) | 5 | NorthSec 2026 |
| Renewable Energy Mobility (REM) (6/7) | 3 | NorthSec 2026 |
| Renewable Energy Mobility (REM) (5/7) | 2 | NorthSec 2026 |
| Renewable Energy Mobility (REM) (4/7) | 2 | NorthSec 2026 |
| Renewable Energy Mobility (REM) (3/7) | 2 | NorthSec 2026 |
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Charles F. Hamilton started RingZer0 website in 2014 by hosting everything in his own garage (Picture here). You can find the list of users that contributed over the years here.
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