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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
651	zante111	119	0	2023-06-19 15:17:20
652	2WY7FC	119	0	2023-03-13 18:57:14
653	maboum	119	0	2022-09-16 16:12:28
654	olivier.buca	119	0	2021-09-13 19:49:04
655	w31rd0	119	0	2019-07-05 08:11:47
656	Hepaj	119	0	2019-04-01 07:14:05
657	ylm	119	0	2019-01-12 22:37:34
658	cesium137	119	0	2018-12-20 00:50:39
659	ken2812221	119	0	2017-04-05 14:15:49
660	tsmr	118	11	2023-12-15 10:59:58
661	ramsexy	118	5	2016-02-10 23:23:06
662	whichroot	118	0	2025-09-02 23:58:53
663	DaggaBoom	118	0	2019-09-10 05:48:10
664	karwer	117	0	2022-06-17 12:46:36
665	saurabh	117	0	2020-03-25 13:07:00
666	lumpus	116	4	2022-03-22 01:07:35
667	tmdahr1245	116	0	2025-03-28 01:38:24
668	Thracky	116	0	2021-04-01 15:19:31
669	MrBow	116	0	2017-06-13 08:24:00
670	w00dy	116	0	2017-05-15 06:52:51
671	joohk10	116	0	2016-05-17 07:33:11
672	isra17	116	0	2014-11-19 21:47:19
673	icecrack	115	8	2017-02-09 13:51:30
674	El_Duna	115	0	2023-04-20 04:02:46
675	sashaCTF	115	0	2022-10-03 18:02:22
676	nchamaa	115	0	2018-08-09 15:20:26
677	hanto	115	0	2018-06-07 21:02:41
678	Scalvando	115	0	2017-10-21 17:26:50
679	scissors	115	0	2017-03-09 13:31:56
680	Infini7y_G4untlet	115	0	2015-06-15 19:00:28
681	jsaigle	114	61	2021-10-12 21:50:07
682	Greg_IT	114	44	2020-08-21 11:46:02
683	falconfeast	114	41	2019-02-19 20:16:54
684	Echo	114	4	2023-10-14 02:11:56
685	bit	114	1	2021-01-31 23:51:37
686	kiko02	114	0	2025-07-31 17:54:19
687	Dungcvhe160469	114	0	2022-10-28 11:12:24
688	Omalax	114	0	2019-04-13 10:20:15
689	koaidien	114	0	2017-03-23 05:28:56
690	ldionmarcil	114	0	2016-09-14 12:37:39
691	cavetruffle	113	15	2020-05-04 09:52:20
692	jucci	113	0	2023-05-12 16:26:53
693	farmingo	113	0	2022-04-12 20:09:37
694	invictim	113	0	2020-05-01 20:40:52
695	Luthorien	113	0	2020-02-04 11:49:01
696	xhku	113	0	2020-01-15 10:58:52
697	y451n	113	0	2019-10-14 14:56:47
698	ipowner	113	0	2018-10-30 00:13:35
699	morfal	113	0	2017-06-07 16:33:02
700	riusalvi	112	43	2018-05-27 01:29:33

Search by username

Latest challenges validations

Last validation	Challenge	User who solved it
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
2025-09-05 06:00:21	PHP Fairy	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.