## HACKVent 2020 – Day 7

One of the elves recently took a programming 101 course. Trying to be helpful, he implemented a program for Santa to generate all the flags for him for this year’s HACKvent 2020. The problem is, he can’t remember how to use the program any more and the link to the documentation just says 404 Not found.…

## Challenge – Twelve steps of christmas

On the sixth day of Christmas my true love sent to me…

six valid QRs,
five potential scrambles,
four orientation bottom and right,
and the rest has been said previously.

a printer

selbmarcs

## Solution

Since I am not that much into rubik cubes, I tried the brute force method.…

## Challenge – Image DNA

Santa has thousands of Christmas balls in stock. They all look the same, but he can still tell them apart. Can you see the difference?

## Solution

The first attempt so solving the challenge was to load the images into an editor and inspect them visually.…

## Challenge – HV20.04 Br❤️celet

Santa was given a nice bracelet by one of his elves. Little does he know that the secret admirer has hidden a message in the pattern of the bracelet…

Over the day, two sets of hints were given:

1. No internet is required – only the bracelet (#1)
2. The message is encoded in binary (#1)
3. Violet color is the delimiter (#2)
4. Colors have a fixed order (#2)
5. Missing colors matter(#2)

## Solution

We started the challenge in the afternoon, when all hint were already given.…

## HACKVent 2020 – Day 3

One of the elves has unfortunately added a password to the last presents delivery and we cannot open it. The elf has taken a few days off after all the stress of the last weeks and is not available.…

## Challenge – Chinese Animals

I’ve received this note from a friend, who is a Chinese CTF player:

Unfortunately, Google Translate wasn’t of much help:

I suspect the data has somehow been messed up while transmitting it.

## Challenge – Happy HACKvent 2020

Welcome to this year’s HACKvent.

Attached you can find the “Official” invitation to the HackVent.

One of my very young Cyber Elves cut some parts of the card with his alpha scissors.

Have a great HACKvent,

– Santa

## Solution

Those alpha scissors are clearly a hint.…

## Challenge – Twelve steps of christmas

On the third day of christmas my true love sent to me…

two to (the) six basic arguments,
one quick response.

Sbopb 3 alkb! Lcc tfqe vlr! Dbq yxzh ql tloh!