ångstromctf 2019


CTF Archive

Welcome to ångstromCTF 2022

A capture-the-flag (CTF) competition hosted and organized entirely by alumni and current students of Montgomery Blair High School! CTF cybersecurity competitions have become an increasingly popular way for students to learn more about cybersecurity and develop and refine their hacking skills. These competitions are designed to educate and inspire high school students through interactive hacking challenges.
The first ångstromCTF took place April 8-17, 2016. It was a phenomenal success, with almost 500 teams participating and submitting thousands of problem solutions. Since then, we've run a competition every year and grown to host more than 1,500 scoring teams. As we expand our competition to an even wider audience, our chief goal remains making our competition as accessible as possible to students with little to no background knowledge in hacking and cybersecurity.
Students will compete in small teams. Points are given for answering each question (entering the flag). Prizes will be awarded to the top-scoring U.S. high-school teams.
ångstromCTF is intended both for beginners and experienced CTFers and consists of questions ranging from simple to very difficult in various categories. There are five categories of problems:

Original Date: Sat, 20 April 2019, 00:00 UTC — Thu, 25 April 2019, 00:00 UTC
Original URL: https://2019.angstromctf.com/
CTFtime Entry: ångstromCTF 2019
Original Team: ångstromCTF Organizers


Challenges

I found this flag somewhere when I was taking a walk, but it seems to have been encrypted with this Really Secure Algorithm!

Use flagCheck to input the flag you get from the challenge to get the actual flag

Author: lamchcl

The year is 20XX. ångstromCTF only has pwn challenges, and the winner is solely determined by who can establish a socket connection first. In the data remnants of an ancient hard disk, we've recovered a string of letters and digits. The only clue is the etching on the disk's surface: Paillier.

Use flagCheck to input the flag you get from the challenge to get the actual flag

Author: defund

defund found out about this cool new dark web browser! While he was browsing the dark web he came across this service that sells rope chains on the black market, but they're super overpriced! He managed to get the source code. Can you get him a rope chain without paying?

Use the following command to execute the Binary file:

sudo ./chain_of_rope

Author: Aplet123

Everyone knows I'm in over my brain, over my brain ... with this esolang. With eight seconds left in overtime, it's on your mind, it's on your mind ... the source, of course!

Use the following command to execute the Binary file:

sudo ./over_my_brain

Author: defund, lamchcl

Now I like dollars, I like diamonds, I like ints, I like strings. Make Cardi like it please.

Use flagCheck to input the flag you get from the challenge to get the actual flag

Author: SirIan

Whenever I have friends over, I love to brag about things that I can eat in a single bite. Can you give this program a tasty flag that fits the bill?

Use flagCheck to input the flag you get from the challenge to get the actual flag

Author: SirIan

After two break-ins to his shell server, kmh got super paranoid about a third! He's so paranoid that he abandoned the traditional password storage method and came up with this monstrosity! I reckon he used the flag as the password, can you find it?

Use flagCheck to input the flag you get from the challenge to get the actual flag

Author: Aplet123

Long before stegosaurus roamed the earth, another species prowled the sea; here is an artist's rendition.

Use flagCheck to input the flag you get from the challenge to get the actual flag

Author: defund

My friend gave me this program but I couldn't understand what he was saying - what was he trying to tell me?

Use flagCheck to input the flag you get from the challenge to get the actual flag

Author: fireholder

Someone scrubbed defund's paper too hard, and a few of the bytes fell off.

Use flagCheck to input the flag you get from the challenge to get the actual flag

Author: defund

defund accidentally deleted all of his math papers! Help recover them from his computer's raw data.

Use flagCheck to input the flag you get from the challenge to get the actual flag

Author: defund


30-Day Scoreboard:

This scoreboard reflects solves for challenges in this module after the module launched in this dojo.

7-Day | 30-Day | All-Time

Rank Hacker Badges Score