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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 - 52641 players

Position	Username	Points	Gold	Last Validation
851	myalcin81	97	-4	2015-09-26 07:25:28
852	vyaienaid	96	25	2023-11-08 22:43:14
853	transcept	96	18	2025-09-02 18:53:29
854	silentdev	96	6	2022-10-23 22:39:35
855	krn_bhargav	96	6	2020-10-15 01:47:06
856	FalcoGer	96	0	2024-05-02 23:48:45
857	jumbo299	96	0	2022-07-23 00:23:17
858	BlackRat	96	0	2022-04-17 22:42:58
859	uso529133	96	0	2019-04-09 22:28:29
860	yoshi51	96	0	2018-08-19 10:40:28
861	anonymous13	96	0	2018-07-18 22:59:32
862	machinlearner	96	0	2018-05-03 20:21:29
863	cha5126568	96	0	2018-01-01 07:03:37
864	dimitarserg	96	0	2017-10-19 20:52:42
865	hype	96	0	2017-02-28 12:41:50
866	joizel	96	0	2017-01-02 08:44:22
867	tttennis	96	0	2015-06-03 11:44:25
868	professormahi_f	96	-2	2023-03-22 15:56:40
869	Yildiz3	95	22	2018-03-16 14:33:16
870	lapinfidel	95	10	2021-11-22 14:21:06
871	cheetobandito	95	6	2015-05-25 23:21:27
872	biohazard	95	4	2021-08-11 13:47:35
873	benaiah	95	4	2020-01-26 11:55:33
874	Shad0w	95	3	2018-07-19 05:21:26
875	Stalin987	95	0	2025-03-26 10:18:30
876	c_coder_2	95	0	2023-01-31 05:26:15
877	djcomidi	95	0	2021-07-23 10:46:41
878	AndHacker	95	0	2020-10-04 16:41:58
879	xeryxzz	95	0	2020-03-22 20:07:05
880	kuroneko13	95	0	2019-07-12 09:05:11
881	GGGGGGG	95	0	2018-11-16 17:41:16
882	Umuril	95	0	2018-05-07 23:57:20
883	meshx	95	0	2018-01-11 17:15:23
884	kc3028	95	0	2016-11-04 08:53:12
885	Mixbo	95	0	2016-01-28 19:52:43
886	hority	95	0	2014-09-01 21:43:23
887	nissim	94	0	2021-12-09 04:28:58
888	glofdd	94	0	2021-08-17 10:25:22
889	Dcc	94	0	2019-09-17 08:56:29
890	wotwot	94	0	2019-07-22 09:04:31
891	Padraignix	94	0	2019-05-17 10:25:16
892	Mr.Prontissimo	94	0	2019-03-08 20:28:16
893	turshija	94	0	2017-09-17 16:06:58
894	jonniedoe	94	0	2015-06-04 19:23:10
895	Bilal_rizwan	93	17	2019-01-16 15:33:51
896	sherlock	93	2	2017-07-13 21:00:01
897	Neutral.B	93	0	2025-02-05 23:01:48
898	ori0n	93	0	2020-01-26 23:16:16
899	caflamand	93	0	2019-04-10 21:13:13
900	Komasa	93	0	2019-03-12 16:29:44

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.