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Intro to Programming Languages

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Commands

Time of First Successful Submission: 2026-04-06 06:13:19

Command Arguments

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Command History

Time of First Successful Submission: 2026-04-06 06:15:01

The Root Path

Time of First Successful Submission: 2026-04-06 06:40:06

Absolute Paths

Time of First Successful Submission: 2026-04-06 06:41:07

Changing position

Time of First Successful Submission: 2026-04-06 06:42:30

Changing to an Absolute Path

Time of First Successful Submission: 2026-04-06 06:44:12

Relative Paths

Time of First Successful Submission: 2026-04-06 06:49:03

Cat

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Ls

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Ls All

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Find

Time of First Successful Submission: 2026-04-06 13:18:45

Piping Echo

Time of First Successful Submission: 2026-04-07 13:44:31

Piping Stdout

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Piping Stdin

Time of First Successful Submission: 2026-04-07 14:15:26

Start Here

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Using the Terminal

Time of First Successful Submission: 2026-04-05 09:37:25

Using the VSCode Workspace

Time of First Successful Submission: 2026-04-05 09:40:08

Using the GUI Desktop

Time of First Successful Submission: 2026-04-05 09:46:35

Pasting into the Desktop

Time of First Successful Submission: 2026-04-05 09:51:05

Restarting Challenges

Time of First Successful Submission: 2026-04-05 10:03:41

Challenge Programs

Time of First Successful Submission: 2026-04-05 10:09:04

The Flag File

Time of First Successful Submission: 2026-04-05 10:11:01

Using Privileged Mode

Time of First Successful Submission: 2026-04-05 10:18:44

Persistent Home Directories - One

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Persistent Home Directories - Two

Time of First Successful Submission: 2026-04-05 10:25:31

Linux Luminarium

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Intro to Commands

Time of First Successful Submission: 2026-04-06 06:13:19

Intro to Arguments

Time of First Successful Submission: 2026-04-06 06:14:16

Command History

Time of First Successful Submission: 2026-04-06 06:15:01

The Root

Time of First Successful Submission: 2026-04-06 06:40:06

Program and absolute paths

Time of First Successful Submission: 2026-04-06 06:41:07

Position thy self

Time of First Successful Submission: 2026-04-06 06:42:30

Position elsewhere

Time of First Successful Submission: 2026-04-06 06:44:12

implicit relative paths, from /

Time of First Successful Submission: 2026-04-06 06:49:03

explicit relative paths, from /

Time of First Successful Submission: 2026-04-06 06:52:29

implicit relative path

Time of First Successful Submission: 2026-04-06 06:54:33

home sweet home

Time of First Successful Submission: 2026-04-06 07:00:07

cat: not the pet, but the command!

Time of First Successful Submission: 2026-04-06 07:34:08

catting absolute paths

Time of First Successful Submission: 2026-04-06 07:34:53

more catting practice

Time of First Successful Submission: 2026-04-06 07:35:57

grepping for a needle in a haystack

Time of First Successful Submission: 2026-04-06 07:37:26

comparing files

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listing files

Time of First Successful Submission: 2026-04-06 12:58:51

touching files

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removing files

Time of First Successful Submission: 2026-04-06 13:00:53

moving files

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copying files

Time of First Successful Submission: 2026-04-06 13:05:37

hidden files

Time of First Successful Submission: 2026-04-06 13:06:45

An Epic Filesystem Quest

Time of First Successful Submission: 2026-04-06 13:13:51

making directories

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finding files

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linking files

Time of First Successful Submission: 2026-04-06 13:30:55

Learning From Documentation

Time of First Successful Submission: 2026-04-07 11:53:35

Learning Complex Usage

Time of First Successful Submission: 2026-04-07 11:56:55

Reading Manuals

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Searching Manuals

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Searching For Manuals

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Helpful Programs

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Help for Builtins

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Matching with *

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Matching with ?

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Matching with []

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Matching paths with []

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Multiple globs

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Mixing globs

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Exclusionary globbing

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Tab completion

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Multiple options for tab completion

Time of First Successful Submission: 2026-04-07 13:39:19

Tab completion on commands

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Redirecting output

Time of First Successful Submission: 2026-04-07 13:44:31

Redirecting more output

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Appending output

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Redirecting errors

Time of First Successful Submission: 2026-04-07 14:01:54

Redirecting input

Time of First Successful Submission: 2026-04-07 14:15:26

Grepping stored results

Time of First Successful Submission: 2026-04-07 14:19:04

Grepping live output

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Grepping errors

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Filtering with grep -v

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Filtering with sed

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Duplicating piped data with tee

Time of First Successful Submission: 2026-04-07 14:38:04

Process substitution for input

Time of First Successful Submission: 2026-04-07 15:16:21

Writing to multiple programs

Time of First Successful Submission: 2026-04-07 15:26:13

Split-piping stderr and stdout

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Named pipes

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Printing Variables

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Setting Variables

Time of First Successful Submission: 2026-04-07 16:11:01

Multi-word Variables

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Exporting Variables

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Printing Exported Variables

Time of First Successful Submission: 2026-04-07 16:17:33

Storing Command Output

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Reading Input

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Reading Files

Time of First Successful Submission: 2026-04-07 16:31:11

Translating characters

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Deleting characters

Time of First Successful Submission: 2026-04-07 16:43:57

Deleting newlines

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Extracting the first lines with head

Time of First Successful Submission: 2026-04-08 13:06:37

Extracting specific sections of text

Time of First Successful Submission: 2026-04-08 13:12:16

Sorting data

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Listing Processes

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Killing Processes

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Interrupting Processes

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Killing Misbehaving Processes

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Suspending Processes

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Resuming Processes

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Backgrounding Processes

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Foregrounding Processes

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Starting Backgrounded Processes

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Process Exit Codes

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Becoming root with su

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Other users with su

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Cracking passwords

Time of First Successful Submission: 2026-04-08 13:43:42

Using sudo

Time of First Successful Submission: 2026-04-08 13:46:01

Changing File Ownership

Time of First Successful Submission: 2026-04-09 13:35:48

Groups and Files

Time of First Successful Submission: 2026-04-09 13:39:01

Fun With Groups Names

Time of First Successful Submission: 2026-04-09 13:41:04

Changing Permissions

Time of First Successful Submission: 2026-04-09 13:49:23

Executable Files

Time of First Successful Submission: 2026-04-09 14:35:13

Permission Tweaking Practice

Time of First Successful Submission: 2026-04-09 15:01:32

Permissions Setting Practice

Time of First Successful Submission: 2026-04-09 15:08:34

The SUID Bit

Time of First Successful Submission: 2026-04-09 15:10:54

Chaining with Semicolons

Time of First Successful Submission: 2026-04-09 15:21:58

Building on Success

Time of First Successful Submission: 2026-04-09 15:23:19

Handling Failure

Time of First Successful Submission: 2026-04-09 15:24:19

Your First Shell Script

Time of First Successful Submission: 2026-04-09 15:27:39

Redirecting Script Output

Time of First Successful Submission: 2026-04-09 15:34:24

Executable Shell Scripts

Time of First Successful Submission: 2026-04-09 15:38:17

Understanding Shebangs

Time of First Successful Submission: 2026-04-09 15:42:13

Scripting with Arguments

Time of First Successful Submission: 2026-04-09 15:46:00

Scripting with Conditionals

Time of First Successful Submission: 2026-04-09 15:49:31

Scripting with Default Cases

Time of First Successful Submission: 2026-04-09 15:50:32

Scripting with Multiple Conditions

Time of First Successful Submission: 2026-04-09 15:54:47

Reading Shell Scripts

Time of First Successful Submission: 2026-04-09 15:58:04

Launching Screen

Time of First Successful Submission: 2026-04-09 15:59:07

Detaching and Attaching

Time of First Successful Submission: 2026-04-09 16:02:17

Finding Sessions

Time of First Successful Submission: 2026-04-09 16:03:29

Switching Windows

Time of First Successful Submission: 2026-04-09 16:04:36

Detaching and Attaching (tmux)

Time of First Successful Submission: 2026-04-09 16:07:32

Switching Windows (tmux)

Time of First Successful Submission: 2026-04-09 18:41:33

The PATH Variable

Time of First Successful Submission: 2026-04-10 06:18:21

Setting PATH

Time of First Successful Submission: 2026-04-10 06:22:12

Finding Commands

Time of First Successful Submission: 2026-04-10 06:23:44

Adding Commands

Time of First Successful Submission: 2026-04-10 06:38:41

Hijacking Commands

Time of First Successful Submission: 2026-04-10 07:08:13

Bashrc Backdoor

Time of First Successful Submission: 2026-04-10 11:13:49

Sniffing Input

Time of First Successful Submission: 2026-04-10 11:59:44

Overshared Directories

Time of First Successful Submission: 2026-04-13 12:04:40

Tricky Linking

Time of First Successful Submission: 2026-04-13 12:24:14

Sniffing Process Arguments

Time of First Successful Submission: 2026-04-13 12:30:54

Snooping on Configurations

Time of First Successful Submission: 2026-04-13 12:35:54

The Fork Bomb

Time of First Successful Submission: 2026-04-17 07:59:25

Disk-Space Doomsday

Time of First Successful Submission: 2026-04-13 18:06:17

rm -rf /

Time of First Successful Submission: 2026-04-13 18:09:08

Life after rm -rf /

Time of First Successful Submission: 2026-04-13 18:11:50

Finding meaning after rm -rf /

Time of First Successful Submission: 2026-04-13 18:14:48

Computing 101

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Your First Register

Time of First Successful Submission: 2026-04-14 13:02:04

Your First Syscall

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Exit Codes

Time of First Successful Submission: 2026-04-14 13:22:21

Building Executables

Time of First Successful Submission: 2026-04-14 13:30:36

Moving Between Registers

Time of First Successful Submission: 2026-04-14 13:39:04

Loading From Memory

Time of First Successful Submission: 2026-04-14 15:20:35

More Loading Practice

Time of First Successful Submission: 2026-04-14 15:22:23

Dereferencing Pointers

Time of First Successful Submission: 2026-04-14 18:46:54

Dereferencing Yourself

Time of First Successful Submission: 2026-04-14 19:02:58

Dereferencing with Offsets

Time of First Successful Submission: 2026-04-15 06:29:40

Stored Addresses

Time of First Successful Submission: 2026-04-15 06:38:08

Double Dereference

Time of First Successful Submission: 2026-04-15 06:43:21

The Stack

Time of First Successful Submission: 2026-04-15 11:01:05

Stack Offsets

Time of First Successful Submission: 2026-04-15 11:04:49

Program Arguments on the Stack

Time of First Successful Submission: 2026-04-15 11:10:15

Popping From the Stack

Time of First Successful Submission: 2026-04-15 11:14:45

Disassembling Programs

Time of First Successful Submission: 2026-04-16 13:23:23

Tracing Syscalls

Time of First Successful Submission: 2026-04-16 13:26:24

Starting GDB

Time of First Successful Submission: 2026-04-16 13:27:43

Quitting GDB

Time of First Successful Submission: 2026-04-16 13:30:47

Starting Programs in GDB

Time of First Successful Submission: 2026-04-16 13:32:05

Disassembling in GDB

Time of First Successful Submission: 2026-04-16 13:33:07

Stepping Through Instructions

Time of First Successful Submission: 2026-04-16 13:34:40

Reading Register Values

Time of First Successful Submission: 2026-04-16 13:35:33

Popping Stack Values

Time of First Successful Submission: 2026-04-16 13:36:46

Examining Memory

Time of First Successful Submission: 2026-04-16 13:38:31

Examining Stack Pointers

Time of First Successful Submission: 2026-04-16 13:41:40

Cooperative Debugging

Time of First Successful Submission: 2026-04-16 13:46:46

Writing Output

Time of First Successful Submission: 2026-04-16 14:12:43

Chaining Syscalls

Time of First Successful Submission: 2026-04-16 14:16:48

Writing Strings

Time of First Successful Submission: 2026-04-16 14:18:31

Reading Data

Time of First Successful Submission: 2026-04-16 14:24:37

Opening Files

Time of First Successful Submission: 2026-04-16 14:42:20

Hardcoding the Filename

Time of First Successful Submission: 2026-04-16 16:04:24

Comparing Values

Time of First Successful Submission: 2026-04-17 06:44:02

Comparing Characters

Time of First Successful Submission: 2026-04-17 06:47:02

Conditional Control Flow

Time of First Successful Submission: 2026-04-17 06:52:29

Comparing Strings

Time of First Successful Submission: 2026-04-17 06:57:17

Reverse the Password

Time of First Successful Submission: 2026-04-17 07:05:07

Conditionals Without Conditionals

Time of First Successful Submission: 2026-04-17 08:06:48

Looping

Time of First Successful Submission: 2026-04-17 08:23:07

Reverse the Calculation

Time of First Successful Submission: 2026-04-17 08:29:49

Reverse the Reverse

Time of First Successful Submission: 2026-04-17 08:32:06

Dealing with Bitwise Operations

Time of First Successful Submission: 2026-04-17 08:34:35

Loops on Data

Time of First Successful Submission: 2026-04-17 08:42:44

set-register

Time of First Successful Submission: 2026-04-17 09:11:48

set-multiple-registers

Time of First Successful Submission: 2026-04-17 09:13:38

add-to-register

Time of First Successful Submission: 2026-04-17 09:14:51

linear-equation-registers

Time of First Successful Submission: 2026-04-17 09:23:02

integer-division

Time of First Successful Submission: 2026-04-17 09:27:19

modulo-operation

Time of First Successful Submission: 2026-04-17 10:41:41

set-upper-byte

Time of First Successful Submission: 2026-04-17 10:47:39

efficient-modulo

Time of First Successful Submission: 2026-04-17 11:13:51

byte-extraction

Time of First Successful Submission: 2026-04-17 11:46:13

bitwise-and

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check-even

Time of First Successful Submission: 2026-04-17 12:50:45

memory-read

Time of First Successful Submission: 2026-04-17 12:55:04

memory-write

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memory-increment

Time of First Successful Submission: 2026-04-17 13:05:39

byte-access

Time of First Successful Submission: 2026-04-17 13:15:48

memory-size-access

Time of First Successful Submission: 2026-04-17 13:19:30

little-endian-write

Time of First Successful Submission: 2026-04-17 13:26:28

memory-sum

Time of First Successful Submission: 2026-04-18 11:44:45

stack-subtraction

Time of First Successful Submission: 2026-04-21 07:08:05

swap-stack-values

Time of First Successful Submission: 2026-04-21 07:10:49

average-stack-values

Time of First Successful Submission: 2026-04-21 07:20:45

absolute-jump

Time of First Successful Submission: 2026-04-21 07:25:18

relative-jump

Time of First Successful Submission: 2026-04-21 07:41:52

jump-trampoline

Time of First Successful Submission: 2026-04-21 07:55:35

conditional-jump

Time of First Successful Submission: 2026-04-21 09:24:41

indirect-jump

Time of First Successful Submission: 2026-04-21 11:13:32

average-loop

Time of First Successful Submission: 2026-04-21 12:02:11

count-non-zero

Time of First Successful Submission: 2026-04-21 12:24:44

string-lower

Time of First Successful Submission: 2026-04-21 13:19:06

most-common-byte

Time of First Successful Submission: 2026-04-21 17:18:45

Exit

Time of First Successful Submission: 2026-04-22 13:03:55

Socket

Time of First Successful Submission: 2026-04-22 14:29:59

Bind

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Listen

Time of First Successful Submission: 2026-04-23 12:37:02

Accept

Time of First Successful Submission: 2026-04-23 12:45:47

Static Response

Time of First Successful Submission: 2026-04-23 13:10:09

Dynamic Response

Time of First Successful Submission: 2026-04-23 15:06:56

Iterative GET Server

Time of First Successful Submission: 2026-04-24 07:53:21

Concurrent GET Server

Time of First Successful Submission: 2026-04-25 06:43:07

Concurrent POST Server

Time of First Successful Submission: 2026-04-25 07:45:09

Web Server

Time of First Successful Submission: 2026-04-25 09:27:38

Debugging Programs

Time of First Successful Submission: 2026-04-25 10:13:59

Inspecting Registers

Time of First Successful Submission: 2026-04-25 10:18:52

Examining Memory

Time of First Successful Submission: 2026-04-25 10:28:59

Setting Breakpoints

Time of First Successful Submission: 2026-04-25 11:07:16

GDB Scripting

Time of First Successful Submission: 2026-04-27 14:20:15

Modifying Data

Time of First Successful Submission: 2026-04-27 14:45:19

Modifying Execution

Time of First Successful Submission: 2026-04-27 15:05:59

Broken Functions

Time of First Successful Submission: 2026-04-27 16:03:03

Playing With Programs

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What's the password?

Time of First Successful Submission: 2026-04-28 14:37:33

... and again!

Time of First Successful Submission: 2026-04-28 14:38:08

Newline Troubles

Time of First Successful Submission: 2026-04-28 14:46:31

Reasoning about files

Time of First Successful Submission: 2026-04-28 15:02:07

Specifying Filenames

Time of First Successful Submission: 2026-04-28 15:07:46

Binary and Hex Encoding

Time of First Successful Submission: 2026-04-28 15:14:39

More Hex

Time of First Successful Submission: 2026-04-28 15:21:34

Decoding Hex

Time of First Successful Submission: 2026-05-01 07:00:31

Decoding Practice

Time of First Successful Submission: 2026-05-01 07:33:42

Encoding Practice

Time of First Successful Submission: 2026-05-02 11:48:32

Hex-encoding ASCII

Time of First Successful Submission: 2026-05-02 12:09:52

Nested Encoding

Time of First Successful Submission: 2026-05-02 13:23:08

Hex-encoding UTF-8

Time of First Successful Submission: 2026-05-02 13:44:33

UTF Mixups

Time of First Successful Submission: 2026-05-02 14:38:43

Modifying Encoded Data

Time of First Successful Submission: 2026-05-02 15:41:51

Decoding Base64

Time of First Successful Submission: 2026-05-02 16:04:44

Encoding Base64

Time of First Successful Submission: 2026-05-02 16:07:10

Dealing with Obfuscation

Time of First Successful Submission: 2026-05-04 06:12:29

Dealing with Obfuscation 2

Time of First Successful Submission: 2026-05-04 06:27:00

Your First HTTP Request

Time of First Successful Submission: 2026-05-07 06:10:39

Reading Flask

Time of First Successful Submission: 2026-05-07 06:31:16

Commented Data

Time of First Successful Submission: 2026-05-07 06:42:33

HTTP Metadata

Time of First Successful Submission: 2026-05-07 06:39:35

HTTP (netcat)

Time of First Successful Submission: 2026-05-07 12:31:35

HTTP Paths (netcat)

Time of First Successful Submission: 2026-05-07 12:40:44

HTTP (curl)

Time of First Successful Submission: 2026-05-07 12:49:36

HTTP (python)

Time of First Successful Submission: 2026-05-07 12:53:57

HTTP Host Header (python)

Time of First Successful Submission: 2026-05-07 13:07:51

HTTP Host Header (curl)

Time of First Successful Submission: 2026-05-07 13:32:08

HTTP Host Header (netcat)

Time of First Successful Submission: 2026-05-07 13:42:57

URL Encoding (netcat)

Time of First Successful Submission: 2026-05-07 13:48:13

HTTP GET Parameters

Time of First Successful Submission: 2026-05-07 13:54:07

Multiple HTTP Parameters (netcat)

Time of First Successful Submission: 2026-05-07 14:02:18

Multiple HTTP Parameters (curl)

Time of First Successful Submission: 2026-05-07 14:09:04

HTTP Forms

Time of First Successful Submission: 2026-05-07 14:11:49

HTTP Forms (curl)

Time of First Successful Submission: 2026-05-07 14:17:33

HTTP Forms (netcat)

Time of First Successful Submission: 2026-05-07 14:23:31

HTTP Forms (python)

Time of First Successful Submission: 2026-05-08 06:38:34

HTTP Forms Without Forms

Time of First Successful Submission: 2026-05-08 07:10:33

Multiple Form Fields (curl)

Time of First Successful Submission: 2026-05-08 07:19:53

Multiple Form Fields (netcat)

Time of First Successful Submission: 2026-05-08 07:35:21

HTTP Redirects (netcat)

Time of First Successful Submission: 2026-05-08 07:50:53

HTTP Redirects (curl)

Time of First Successful Submission: 2026-05-08 07:53:57

HTTP Redirects (python)

Time of First Successful Submission: 2026-05-08 07:55:26

HTTP Cookies (curl)

Time of First Successful Submission: 2026-05-08 08:00:34

HTTP Cookies (netcat)

Time of First Successful Submission: 2026-05-08 08:06:17

HTTP Cookies (python)

Time of First Successful Submission: 2026-05-08 08:11:08

Server State (python)

Time of First Successful Submission: 2026-05-08 08:16:23

Listening Web

Time of First Successful Submission: 2026-05-08 09:14:13

Speaking Redirects

Time of First Successful Submission: 2026-05-08 10:55:06

JavaScript Redirects

Time of First Successful Submission: 2026-05-08 13:16:42

Including JavaScript

Time of First Successful Submission: 2026-05-09 15:15:00

HTTP (javascript)

Time of First Successful Submission: 2026-05-11 14:55:14

HTTP Get Parameters (javascript)

Time of First Successful Submission: 2026-05-11 15:21:01

HTTP Forms (javascript)

Time of First Successful Submission: 2026-05-12 06:33:43

GCA CTF

12 / 104 2287 / 45599

Using the Terminal

Time of First Successful Submission: 2026-04-05 09:37:25

Using the VSCode Workspace

Time of First Successful Submission: 2026-04-05 09:40:08

Using the GUI Desktop

Time of First Successful Submission: 2026-04-05 09:46:35

Pasting into the Desktop

Time of First Successful Submission: 2026-04-05 09:51:05

Connecting over SSH

Time of First Successful Submission: 2026-04-05 09:57:01

Restarting Challenges

Time of First Successful Submission: 2026-04-05 10:03:41

Getting Help

Time of First Successful Submission: 2026-04-05 10:07:24

Challenge Programs

Time of First Successful Submission: 2026-04-05 10:09:04

The Flag File

Time of First Successful Submission: 2026-04-05 10:11:01

Using Privileged Mode

Time of First Successful Submission: 2026-04-05 10:18:44

Persistent Home Directories - One

Time of First Successful Submission: 2026-04-05 10:24:07

Persistent Home Directories - Two

Time of First Successful Submission: 2026-04-05 10:25:31