ctf-writeup/2023/SunshineCTF 2023/BeepBoop Cryptography
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README.md feat: grouped the challs 2024-01-09 16:59:32 +07:00

README.md

BeepBoop Cryptography

Help! My IOT device has gone sentient! All I wanted to know was the meaning of 42!

It's also waving its arms up and down, and I...

oh no! It's free!

AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA

Automated Challenge Instructions Detected failure in challenge upload. Original author terminated. Please see attached file BeepBoop for your flag... human.

About the Challenge

We got a file called BeepBoop and in this file there are only 2 words, beep and boop

beep beep beep beep boop beep boop beep beep boop boop beep beep boop boop beep beep boop boop beep boop beep beep beep beep boop boop beep beep beep beep boop beep boop boop boop boop beep boop boop beep boop boop boop beep beep boop beep beep boop boop beep boop beep boop boop beep boop boop beep beep boop boop boop beep boop boop boop beep beep boop beep beep boop boop beep beep boop beep boop beep boop boop boop boop beep boop beep beep boop boop boop beep boop boop beep beep boop boop beep beep beep beep boop beep boop boop beep boop boop boop beep beep boop boop beep beep boop boop boop beep boop boop boop beep beep boop beep beep beep boop beep boop boop beep boop beep boop boop boop beep beep boop beep beep boop boop beep boop beep boop boop beep boop boop beep beep boop boop boop beep boop boop boop beep beep boop beep beep boop boop beep beep boop beep boop beep boop boop boop boop beep boop beep beep boop boop boop beep boop boop beep beep boop boop beep beep beep beep boop beep boop boop beep boop boop boop beep beep boop boop beep beep boop boop boop beep boop boop boop beep beep boop beep beep beep boop beep boop boop beep boop beep boop boop boop beep beep boop beep beep boop boop beep boop beep boop boop beep boop boop beep beep boop boop boop beep boop boop boop beep beep boop beep beep boop boop beep beep boop beep boop beep boop boop boop boop beep boop beep beep boop boop boop beep boop boop beep beep boop boop beep beep beep beep boop beep boop boop beep boop boop boop beep beep boop boop beep beep boop boop boop beep boop boop boop beep beep boop beep beep boop boop boop boop boop beep boop

How to Solve?

The first thing that came to my mind when I saw this file was binary code. The word beep may represent the number 0 and boop may represent the number 1

binary

Hmmm the output was fha{rkgrezvangr-rkgrezvangr-rkgrezvangr}.It looks like we need to shift the characters using ROT13

flag

sun{exterminate-exterminate-exterminate}