The master stash guard | Hunt the Flag

Labs need a computer

Open this page on a computer, or make the browser window larger.

Files

rev-boss.zip
Size: 1.1 KB
SHA-256
ee56e22ad39361fa7a01d8034092006430ef607fba851dc7c54b67c15199defc
Download

After downloading, compare the file SHA-256 with the value shown here to make sure it arrived intact.

Tools you may need

node
To run and trace the guard.

Scenario

A multi-stage Ravens guard reverses your input then applies a rolling XOR and compares to an embedded target. Invert both stages to recover the master stash code. The leader showdown. The artifact is inert: it reads input and prints a verdict only — no network, no writes, no persistence.

What you are looking at

You download rev-boss.zip with guard.js transforming the input in two reversible stages and comparing to an embedded target.

Goal

Invert both stages on the target to recover the master stash code, the flag.

What counts as solved

You enter the correct flag.

Method checklist

Tick each step as you work through it. The steps are the method, not the answer.

Read guard.js and understand the two stages.
Re-apply the rolling XOR to the target.
Reverse the byte order.
Read the flag.

Hints

You have not revealed a hint yet. Ask the falcon when you need one.