KOREONE

🐧

kore.one

Germany

Cryptographic Exploitation

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Language Barrier

Time of First Successful Submission: 2025-11-19 17:04:45

Baby Steps

Time of First Successful Submission: 2025-11-19 17:07:41

Roman Cryptography

Time of First Successful Submission: 2025-11-19 17:10:41

Obscura

Time of First Successful Submission: 2025-11-19 17:12:08

XOR

Time of First Successful Submission: 2025-11-19 17:39:32

XOR 2.0

Time of First Successful Submission: 2025-11-19 17:42:27

Modular Arithmetic

Time of First Successful Submission: 2025-11-20 10:43:42

Modular Inverse

Time of First Successful Submission: 2025-11-20 10:49:03

Chinese Remainder Theorem

Time of First Successful Submission: 2025-11-20 12:16:52

Fermat Theorem

Time of First Successful Submission: 2025-11-20 12:23:26

Final Boss

Time of First Successful Submission: 2025-11-20 12:41:10


Intro to Programming Languages

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Commands

Time of First Successful Submission: 2025-11-13 21:16:11

Command Arguments

Time of First Successful Submission: 2025-11-13 21:17:07

Command History

Time of First Successful Submission: 2025-11-13 21:18:06

The Root Path

Time of First Successful Submission: 2025-11-18 09:25:22

Absolute Paths

Time of First Successful Submission: 2025-11-18 09:27:30

Changing position

Time of First Successful Submission: 2025-11-18 09:28:10

Changing to an Absolute Path

Time of First Successful Submission: 2025-11-18 09:30:01

Relative Paths

Time of First Successful Submission: 2025-11-18 09:30:48

Cat

Time of First Successful Submission: 2025-11-18 09:37:30

Ls

Time of First Successful Submission: 2025-11-18 09:41:13

Ls All

Time of First Successful Submission: 2025-11-18 09:44:42

Find

Time of First Successful Submission: 2025-11-18 09:56:40

Piping Echo

Time of First Successful Submission: 2025-11-18 15:54:50

Piping Stdout

Time of First Successful Submission: 2025-11-18 16:01:48

Piping Stdin

Time of First Successful Submission: 2025-11-19 15:49:45


Start Here

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Using the Terminal

Time of First Successful Submission: 2025-11-09 21:47:44

Using the VSCode Workspace

Time of First Successful Submission: 2025-11-09 21:50:13

Using the GUI Desktop

Time of First Successful Submission: 2025-11-09 21:52:20

Pasting into the Desktop

Time of First Successful Submission: 2025-11-09 21:54:14

Restarting Challenges

Time of First Successful Submission: 2025-11-09 21:57:08

Challenge Programs

Time of First Successful Submission: 2025-11-09 21:40:47

The Flag File

Time of First Successful Submission: 2025-11-09 21:42:43

Using Privileged Mode

Time of First Successful Submission: 2025-11-09 21:46:59

Persistent Home Directories - One

Time of First Successful Submission: 2025-11-13 20:59:40

Persistent Home Directories - Two

Time of First Successful Submission: 2025-11-13 21:01:29


Linux Luminarium

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Intro to Commands

Time of First Successful Submission: 2025-11-13 21:16:11

Intro to Arguments

Time of First Successful Submission: 2025-11-13 21:17:07

Command History

Time of First Successful Submission: 2025-11-13 21:18:06

The Root

Time of First Successful Submission: 2025-11-18 09:25:22

Program and absolute paths

Time of First Successful Submission: 2025-11-18 09:27:30

Position thy self

Time of First Successful Submission: 2025-11-18 09:28:10

Position elsewhere

Time of First Successful Submission: 2025-11-18 09:30:01

implicit relative paths, from /

Time of First Successful Submission: 2025-11-18 09:30:48

explicit relative paths, from /

Time of First Successful Submission: 2025-11-18 09:31:36

implicit relative path

Time of First Successful Submission: 2025-11-18 09:32:42

home sweet home

Time of First Successful Submission: 2025-11-18 09:35:57

cat: not the pet, but the command!

Time of First Successful Submission: 2025-11-18 09:37:30

catting absolute paths

Time of First Successful Submission: 2025-11-18 09:38:07

more catting practice

Time of First Successful Submission: 2025-11-18 09:38:49

grepping for a needle in a haystack

Time of First Successful Submission: 2025-11-18 09:39:53

comparing files

Time of First Successful Submission: 2025-11-18 09:40:35

listing files

Time of First Successful Submission: 2025-11-18 09:41:13

touching files

Time of First Successful Submission: 2025-11-18 09:41:53

removing files

Time of First Successful Submission: 2025-11-18 09:42:29

moving files

Time of First Successful Submission: 2025-11-18 09:43:28

copying files

Time of First Successful Submission: 2025-11-18 09:44:03

hidden files

Time of First Successful Submission: 2025-11-18 09:44:42

An Epic Filesystem Quest

Time of First Successful Submission: 2025-11-18 09:48:56

making directories

Time of First Successful Submission: 2025-11-18 09:49:44

finding files

Time of First Successful Submission: 2025-11-18 09:56:40

linking files

Time of First Successful Submission: 2025-11-18 10:54:47

Learning From Documentation

Time of First Successful Submission: 2025-11-18 10:58:39

Learning Complex Usage

Time of First Successful Submission: 2025-11-18 11:00:50

Reading Manuals

Time of First Successful Submission: 2025-11-18 11:03:10

Searching Manuals

Time of First Successful Submission: 2025-11-18 11:04:33

Searching For Manuals

Time of First Successful Submission: 2025-11-18 11:13:11

Helpful Programs

Time of First Successful Submission: 2025-11-18 11:15:16

Help for Builtins

Time of First Successful Submission: 2025-11-18 11:16:10

Matching with *

Time of First Successful Submission: 2025-11-18 14:59:00

Matching with ?

Time of First Successful Submission: 2025-11-18 15:03:15

Matching with []

Time of First Successful Submission: 2025-11-18 15:28:46

Matching paths with []

Time of First Successful Submission: 2025-11-18 15:32:22

Multiple globs

Time of First Successful Submission: 2025-11-18 15:34:28

Mixing globs

Time of First Successful Submission: 2025-11-18 15:41:20

Exclusionary globbing

Time of First Successful Submission: 2025-11-18 15:44:55

Tab completion

Time of First Successful Submission: 2025-11-18 15:46:01

Multiple options for tab completion

Time of First Successful Submission: 2025-11-18 15:52:31

Tab completion on commands

Time of First Successful Submission: 2025-11-18 15:53:12

Redirecting output

Time of First Successful Submission: 2025-11-18 15:54:50

Redirecting more output

Time of First Successful Submission: 2025-11-18 16:01:48

Appending output

Time of First Successful Submission: 2025-11-18 16:02:52

Redirecting errors

Time of First Successful Submission: 2025-11-18 16:04:35

Redirecting input

Time of First Successful Submission: 2025-11-19 15:49:45

Grepping stored results

Time of First Successful Submission: 2025-11-19 15:50:47

Grepping live output

Time of First Successful Submission: 2025-11-19 15:51:24

Grepping errors

Time of First Successful Submission: 2025-11-19 15:53:43

Filtering with grep -v

Time of First Successful Submission: 2025-11-19 15:54:25

Filtering with sed

Time of First Successful Submission: 2025-11-19 15:55:38

Duplicating piped data with tee

Time of First Successful Submission: 2025-11-19 16:13:06

Process substitution for input

Time of First Successful Submission: 2025-11-19 16:18:01

Writing to multiple programs

Time of First Successful Submission: 2025-11-19 16:19:28

Split-piping stderr and stdout

Time of First Successful Submission: 2025-11-19 16:21:33

Named pipes

Time of First Successful Submission: 2025-11-19 16:26:13

Printing Variables

Time of First Successful Submission: 2025-11-19 16:37:54

Setting Variables

Time of First Successful Submission: 2025-11-19 16:38:35

Multi-word Variables

Time of First Successful Submission: 2025-11-19 16:47:37

Exporting Variables

Time of First Successful Submission: 2025-11-19 16:49:01

Printing Exported Variables

Time of First Successful Submission: 2025-11-19 16:50:02

Storing Command Output

Time of First Successful Submission: 2025-11-19 16:51:32

Reading Input

Time of First Successful Submission: 2025-11-19 16:52:47

Reading Files

Time of First Successful Submission: 2025-11-19 16:53:56

Translating characters

Time of First Successful Submission: 2026-01-02 14:01:38

Deleting characters

Time of First Successful Submission: 2026-01-02 14:02:46

Deleting newlines

Time of First Successful Submission: 2026-01-02 14:06:14

Extracting the first lines with head

Time of First Successful Submission: 2026-01-02 14:07:27

Extracting specific sections of text

Time of First Successful Submission: 2026-01-02 14:09:28

Sorting data

Time of First Successful Submission: 2026-01-02 14:11:06

Listing Processes

Time of First Successful Submission: 2026-01-02 14:13:41

Killing Processes

Time of First Successful Submission: 2026-01-02 14:14:34

Interrupting Processes

Time of First Successful Submission: 2026-01-02 14:15:13

Killing Misbehaving Processes

Time of First Successful Submission: 2026-01-02 14:18:24

Suspending Processes

Time of First Successful Submission: 2026-01-02 14:19:40

Resuming Processes

Time of First Successful Submission: 2026-01-02 14:20:26

Backgrounding Processes

Time of First Successful Submission: 2026-01-02 14:22:47

Foregrounding Processes

Time of First Successful Submission: 2026-01-02 14:24:17

Starting Backgrounded Processes

Time of First Successful Submission: 2026-01-02 14:24:51

Process Exit Codes

Time of First Successful Submission: 2026-01-02 14:26:10

Becoming root with su

Time of First Successful Submission: 2026-01-02 14:27:42

Other users with su

Time of First Successful Submission: 2026-01-02 14:28:46

Cracking passwords

Time of First Successful Submission: 2026-01-02 14:30:40

Using sudo

Time of First Successful Submission: 2026-01-02 14:36:00

Changing File Ownership

Time of First Successful Submission: 2026-01-02 14:40:50

Groups and Files

Time of First Successful Submission: 2026-01-02 14:41:43

Fun With Groups Names

Time of First Successful Submission: 2026-01-02 14:43:03

Changing Permissions

Time of First Successful Submission: 2026-01-02 14:44:21

Executable Files

Time of First Successful Submission: 2026-01-02 14:44:54

Permission Tweaking Practice

Time of First Successful Submission: 2026-01-02 14:50:33

Permissions Setting Practice

Time of First Successful Submission: 2026-01-02 15:51:39

The SUID Bit

Time of First Successful Submission: 2026-01-02 15:52:38

Chaining with Semicolons

Time of First Successful Submission: 2026-01-02 15:55:43

Building on Success

Time of First Successful Submission: 2026-01-02 15:56:15

Handling Failure

Time of First Successful Submission: 2026-01-02 15:56:45

Your First Shell Script

Time of First Successful Submission: 2026-01-02 15:57:57

Redirecting Script Output

Time of First Successful Submission: 2026-01-02 15:59:21

Executable Shell Scripts

Time of First Successful Submission: 2026-01-02 16:01:00

Understanding Shebangs

Time of First Successful Submission: 2026-01-02 16:02:49

Scripting with Arguments

Time of First Successful Submission: 2026-01-02 16:05:17

Scripting with Conditionals

Time of First Successful Submission: 2026-01-02 16:06:40

Scripting with Default Cases

Time of First Successful Submission: 2026-01-02 16:07:43

Scripting with Multiple Conditions

Time of First Successful Submission: 2026-01-02 16:09:48

Reading Shell Scripts

Time of First Successful Submission: 2026-01-02 16:10:32

Launching Screen

Time of First Successful Submission: 2026-01-02 16:11:11

Detaching and Attaching

Time of First Successful Submission: 2026-01-02 16:12:32

Finding Sessions

Time of First Successful Submission: 2026-01-02 16:14:07

Switching Windows

Time of First Successful Submission: 2026-01-02 16:14:53

Detaching and Attaching (tmux)

Time of First Successful Submission: 2026-01-02 16:15:48

Switching Windows (tmux)

Time of First Successful Submission: 2026-01-02 16:17:06

The PATH Variable

Time of First Successful Submission: 2026-01-02 16:19:04

Setting PATH

Time of First Successful Submission: 2026-01-02 16:20:29

Finding Commands

Time of First Successful Submission: 2026-01-02 16:25:09

Adding Commands

Time of First Successful Submission: 2026-01-02 16:28:35

Hijacking Commands

Time of First Successful Submission: 2026-01-02 16:30:57

Bashrc Backdoor

Time of First Successful Submission: 2026-01-03 13:59:31

Sniffing Input

Time of First Successful Submission: 2026-01-03 14:01:11

Overshared Directories

Time of First Successful Submission: 2026-01-03 14:02:47

Tricky Linking

Time of First Successful Submission: 2026-01-03 14:05:32

Sniffing Process Arguments

Time of First Successful Submission: 2026-01-03 14:07:19

Snooping on Configurations

Time of First Successful Submission: 2026-01-03 14:08:32

The Fork Bomb

Time of First Successful Submission: 2026-01-03 14:12:47

Disk-Space Doomsday

Time of First Successful Submission: 2026-01-03 14:14:01

rm -rf /

Time of First Successful Submission: 2026-01-03 14:18:48

Life after rm -rf /

Time of First Successful Submission: 2026-01-03 14:24:49

Finding meaning after rm -rf /

Time of First Successful Submission: 2026-01-03 15:00:13


Computing 101

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Your First Register

Time of First Successful Submission: 2026-01-03 15:14:00


GCA CTF

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Using the Terminal

Time of First Successful Submission: 2025-11-09 21:47:44

Using the VSCode Workspace

Time of First Successful Submission: 2025-11-09 21:50:13

Using the GUI Desktop

Time of First Successful Submission: 2025-11-09 21:52:20

Pasting into the Desktop

Time of First Successful Submission: 2025-11-09 21:54:14

Connecting over SSH

Time of First Successful Submission: 2025-11-18 14:50:50

Restarting Challenges

Time of First Successful Submission: 2025-11-09 21:57:08

Getting Help

Time of First Successful Submission: 2025-11-18 14:54:53

Challenge Programs

Time of First Successful Submission: 2025-11-09 21:40:47

The Flag File

Time of First Successful Submission: 2025-11-09 21:42:43

Using Privileged Mode

Time of First Successful Submission: 2025-11-09 21:46:59

Persistent Home Directories - One

Time of First Successful Submission: 2025-11-13 20:59:40

Persistent Home Directories - Two

Time of First Successful Submission: 2025-11-13 21:01:29