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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.

Chat / Questions / Help

You'll find all what you need in the Discord Server.

Join the Discord now!

Challenges

Currently more than 300 challenges are available over 15 categories. Have fun resolving them.

View challenges »

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 (which is 1288 points at the moment). 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.

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 - 52640 players

Position	Username	Points	Gold	Last Validation
751	lol_wut	106	2	2016-09-06 13:09:22
752	TheFlame	106	0	2020-05-22 19:07:41
753	Skywalker	106	0	2019-12-17 17:30:47
754	autofix_um	106	0	2019-04-15 19:29:09
755	manhhungsqtt	106	0	2018-10-19 16:26:41
756	nanuyokakinu	106	0	2017-01-07 22:54:12
757	woshishui	106	0	2016-03-24 09:38:45
758	xlash911	105	17	2023-03-20 15:33:16
759	blacksmith15	105	3	2018-08-23 22:07:59
760	b3mb4m	105	2	2015-06-06 17:16:56
761	toxic	105	0	2025-06-05 03:49:33
762	JustARandom	105	0	2025-04-28 03:36:23
763	exc4libur2021	105	0	2022-03-03 11:10:59
764	kumarsushobhan	105	0	2020-04-14 09:52:56
765	ahmedezzat119	105	0	2018-09-26 01:11:56
766	dotsu	105	0	2018-07-12 08:36:58
767	Owl	105	0	2016-11-28 00:28:52
768	negelnguyen	105	0	2016-08-16 10:51:31
769	PRL	105	0	2015-10-18 21:46:43
770	Sh3rl0ck83	105	-1	2017-08-13 17:05:21
771	samgjones	104	50	2022-08-23 00:58:56
772	brennords	104	12	2019-12-13 17:06:42
773	argaz	104	12	2017-07-11 17:36:46
774	wobuhuizongwen	104	3	2018-04-10 04:24:56
775	Matt_00	104	1	2022-08-04 20:45:57
776	mturcotte	104	0	2022-05-14 13:27:30
777	mr.timeout	104	0	2022-01-06 20:05:45
778	Maxovitch	104	0	2020-05-28 13:01:53
779	1111JOE1111	104	0	2017-11-05 18:33:50
780	japkettu	103	28	2024-02-14 11:59:13
781	ippokani	103	16	2019-09-10 18:10:46
782	Anubis	103	12	2020-09-01 10:27:51
783	j3romee	103	11	2020-05-13 01:10:53
784	hackern00b	103	6	2023-03-05 00:15:58
785	S0L0	103	0	2025-04-13 16:33:36
786	CQFD	103	0	2022-01-14 16:48:03
787	Qubn	103	0	2020-03-03 18:31:48
788	Chessifer	103	0	2020-01-24 14:44:48
789	Jecey	103	0	2019-06-23 11:53:38
790	vulnhub-ctf	102	1	2015-04-03 18:54:01
791	marcel197025	102	0	2025-07-06 14:43:11
792	jaangers	102	0	2024-02-23 10:31:58
793	elbibi	102	0	2020-08-04 10:32:39
794	Callow	102	0	2019-04-11 10:05:39
795	DarkShell	102	0	2018-04-07 18:10:49
796	Ne0Lux-C1Ph3r	102	0	2017-12-29 18:49:07
797	D0r43m0n	102	0	2015-11-07 12:16:21
798	T1001	102	0	2015-08-10 14:08:04
799	Jane	101	79	2016-08-03 10:06:40
800	dreamer45	101	1	2018-06-10 15:08:49

Search by username

Latest challenges validations

Last validation	Challenge	User who solved it
2025-09-05 09:20:06	Look inside the house	duybdhe190255
2025-09-05 08:07:46	Some martian message	MCTC_Cybersecurity
2025-09-05 07:49:34	You Turn Me On And Off	Vage
2025-09-05 07:33:04	Let's Get Scwhifty!	Vage
2025-09-05 06:08:30	NC8 MAINFRAME MANAGEMENT INTERFACE Part 4	Vage
2025-09-05 06:07:35	NC8 MAINFRAME MANAGEMENT INTERFACE Part 3	Vage
2025-09-05 06:06:58	NC8 MAINFRAME MANAGEMENT INTERFACE Part 2 Flag 3	Vage
2025-09-05 06:06:10	NC8 MAINFRAME MANAGEMENT INTERFACE Part 2 Flag 2	Vage
2025-09-05 06:05:09	NC8 MAINFRAME MANAGEMENT INTERFACE Part 2 Flag 1	Vage
2025-09-05 06:03:44	NC8 MAINFRAME MANAGEMENT INTERFACE Part 1	Vage

The latest write-up with special mention

Author	Challenge	Write-Up
push0ret	I saw a little elf	push0ret-little_elf.pdf
gdenhez	This malware excels Part 1	writeup_340.pdf
transcept	PHP feature or 0day?	240-php-feature-or-0day.md
gdenhez	Just Another MBR Ransomware	writeup_272.pdf
Burton	Internet As A Service	242_Internet_As_A_Service.pdf
Burton	0 Day Store	189_0_Day_Store.pdf
gdenhez	PyJail 1	writeup_97.pdf
gdenhez	PHP Jail 4	writeup_226.pdf
gdenhez	C Jail 6	writeup_259.pdf
fyrefox	Linguistic Memory System	writeup_linguistic_memory_system.pdf

The latest challenges added

Challenge	Points	Category
Disabling the camera operator (4/4)	4	NorthSec 2025
Disabling the camera operator (3/4)	4	NorthSec 2025
Disabling the camera operator (2/4)	3	NorthSec 2025
Disabling the camera operator (1/4)	1	NorthSec 2025
Motor Sensors - Agent 3 (2/2)	4	NorthSec 2025

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.