During their yearly season opening party our super-smart elves developed an improved usage of the well known RSA crypto algorithm. Under the “Green IT” initiative they decided to save computing horsepower (or rather reindeer power?) on their side.…
Since yesterday’s challenge seems to have been a bit on the hard side, we’re adding a small musical innuendo to relax.
My friend Chris from Florida sent me this score. Enjoy! Is this what you call postmodern?…
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.…
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
Since I am not that much into rubik cubes, I tried the brute force method.…
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?
The first attempt so solving the challenge was to load the images into an editor and inspect them visually.…
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.…
I’ve received this note from a friend, who is a Chinese CTF player:
恭喜！收旗爲：ＨＶ２０｛獭慬氭敬敧慮琭扵瑴敲晬礭汯癥猭杲慳猭浵搭桯牳ｅ｝
Unfortunately, Google Translate wasn’t of much help:
I suspect the data has somehow been messed up while transmitting it.
Sadly, I can’t ask my friend about more details.
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
Those alpha scissors are clearly a hint.…
On the third day of christmas my true love sent to me…
three caesar salads,
two to (the) six basic arguments,
one quick response.
Sbopb 3 alkb! Lcc tfqe vlr! Dbq yxzh ql tloh!