--- layout: post title: "DeconstruCT.F 2021 | CRYPTO | The Conspiracy" date: 2021-10-03 13:37:00 +0700 tags: [ctf, writeup] --- <figure> <img src="https://cdn.discordapp.com/attachments/874145963407720513/894206917239513118/Group.png"> </figure> #### CRYPTO | The Conspiracy (150 points | 132 solves) Challenge Description: ``` There was once a sailor who travelled to many countries. He was a quirky old man. He said many many things, and most of what he said never made sense to anyone. He considered himself ahead of his time, and said that the people of his time were unworthy of his wisdom. Soon he was lost to the ages, but his diary wasn't. Are you worthy of decoding his wisdom? ``` We're given the following file (`diary.txt`): ```python 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 ``` Solution:<br> It is base64 encoded message, so I decode it and it gives the following result: ``` dsc{(-18.05572729282756, 178.45700143131674),(19.028282857505392, 103.14426071207107),(42.536705991266146, 1.4930344612276933),(38.5893697217354, 68.81632523058967),_,(50.851518948206795, 4.360180853581986),(7.671863538453386, 36.83726095698952),_,(38.619506740587035, 34.85512642711004),(47.42806157123545, 18.998421101903602),(30.19387158353921, 31.12496611612573),_,(-0.23177559426111558, -78.5033963083949),(-12.85446936733455, 132.79262433883298),(44.424231252577435, 24.350241166279226),(24.8195647413923, 120.97236754005058),(18.584456974403487, -72.31812189614772)} ``` We can see a lot of coordinate, therefore I put it in [Google Maps](http://maps.google.com) and take the first letter of the each country and get the flag. FLAG : **dsc{FLAT_BE_THE_EARTH}**
Last changed by  
 
Sekte Gadeng
242

Read more

DeconstruCT.F 2021 | Forensic | Mike

Forensic | Mike (433 points | 11 solves) Challenge Description: Julia has come to you to ask for help. After spending too much time on his computer, Mike has gone insane, but no one knows why. Can you figure it out? Julia would really appreciate it. Here's how his desktop looked like. Weird how his system time doesn't change.. Wrap the flag that you find with dsc{<flag>}! We're given a file (desktop_wallpaper.png): Solution:

10/4/2021
DeconstruCT.F 2021 | OSINT | Dora the Explorer

OSINT | Dora the Explorer (474 points | 18 solves) Challenge Description: Hi, I am Dora the Explorer and I love exploring as you know ;) (after all 1+1=0), and I recently found this place which has an a very cool looking street art to it. Plus they posted about it on social media many a times. You all should see this too sometime!!! We're given a file (osint.jpg): Solution: View the given file and check the photo. If we look at the metadata there are locations that we can find.

10/4/2021
DeconstruCT.F 2021 | OSINT | AHF

OSINT | AHF (429 points | 11 solves) Challenge Description: We've been listening and we've heard this group can write decent code (ahem ahem), but what have they been listening to? We're given a file (team.pdf), which contains: Solution: The file provided is nothing strange, so we do a search for they team name (Team AtomHeartFather)

10/4/2021
DeconstruCT.F 2021 | OSINT | Flags...and Flags

OSINT | Flags...and Flags (250 points | 5 solves) Challenge Description: The Co-Founder Of Spike music loves flags, and he loves to hide them in plain sight. Find it! Solution: Do a search and find the account in instagram. We get two account,that is Neil Kavalakkat account and Rithik Jain account, who became the co-founder of spike. But there is nothing interesting in Neil Kavalakkat account, so after we realized in Rithik Jain's latest photo there is a qr code in his hand. Just decode the qr code and get the flag

10/4/2021
Read more from Sekte Gadeng
Published on HackMD