htr-tech

Howdy,

Welcome to the writeup for "Keygen" - a CTF challenge that will mainly test your Network analysis skills (little bit of searching too).

Let's dive in.

Simple Inspection

Firstly, the archive name is "RE_0x1.zip". (that was just for distracting😛)

htr-tech

GNUPG Tutorial

1. Generate a GPG key pair : gpg --full-gen-key

2. Please select what kind of key you want: (1) RSA and RSA (default)

3. What keysize do you want? (3072) : 4096

4. Key is valid for? (0) : Set the Expiry Date (eg: 2y)

htr-tech

# Source : https://stackoverflow.com/a/59343705

$env:PATH = [Runtime.InteropServices.RuntimeEnvironment]::GetRuntimeDirectory()
[AppDomain]::CurrentDomain.GetAssemblies() | ForEach-Object {
    $path = $_.Location
    if ($path) { 
        $name = Split-Path $path -Leaf
        Write-Host -ForegroundColor Yellow "`r`nRunning ngen.exe on '$name'"
        ngen.exe install $path /nologo
    }

htr-tech

curl -s https://api.github.com/users/htr-tech/repos | grep \"clone_url\" | awk '{print $2}' | sed -e 's/"//g' -e 's/,//g' | xargs -n1 git clone