PicoCTF Writeup – Mr-Worldwide
# Information:
CTF Name: PicoCTF
CTF Challenge: Mr-Worldwide
Challenge Category: Cryptography
Challenge Points: 200
PicoCTF 2019.
# Challenge Description:
A musician left us a message. What’s it mean?
# Writeup
As you can see in the word message in the description we have a link. Upon clicking in this link a file was downloaded with these contents:
picoCTF{(35.028309, 135.753082)(46.469391, 30.740883)(39.758949, -84.191605)(41.015137, 28.979530)(24.466667, 54.366669)(3.140853, 101.693207)_(9.005401, 38.763611)(-3.989038, -79.203560)(52.377956, 4.897070)(41.085651, -73.858467)(57.790001, -152.407227)(31.205753, 29.924526)}
| Coordenates | City, Country | Letter |
|---|---|---|
| (35.028309, 135.753082) | Kyoto, Japan | K |
| (46.469391, 30.740883) | Odessa, Ukraine | O |
| (39.758949, -84.191605) | Dayton, United States | D |
| (41.015137, 28.979530) | Istanbul, Turkey | I |
| (24.466667, 54.366669) | Abu Dhabi, UAE | A |
| (3.140853, 101.693207) | Kuala Lumpur, Malaysia | K |
| (9.005401, 38.763611) | Addis Ababa, Ethiopia | A |
| (-3.989038, -79.203560) | Loja, Ecuador | L |
| (52.377956, 4.897070) | Amsterdam, Netherlands | A |
| (41.085651, -73.858467) | Sleepy Hollow, USA | S |
| (57.790001, -152.407227) | Kodiak, United States | K |
| (31.205753, 29.924526) | Alexandria, Egypt | A |
By looking at the sequence of cities and countries it my seem random, but if we try to, for example, choose the first letter of each city we get the following:
KODIAK_ALASKA
Very interesting.
The flag is:
Thank you very much for reading!
Cheers,
MRegra
You are so interesting! I do not think I’ve read through something like that before.
So great to discover another person with a few original thoughts
on this subject matter. Really.. thanks for starting this up.
This site is one thing that is needed on the internet, someone with some originality!