DeconstruCTF 2023 Move Writeup

 

Description:

Category: Cryptography
Difficulty: Easy
Points: 100
There is an urgent need for a touch typist in our 13 year old organization, can you find the flag from the encrypted data?

From the challenge description, you would notice one thing for sure if you’re familiar with cryptography challenges in CTFs. It says, “There is an urgent need for a touch typist in our 13 year old organization” .

Whenever I saw 13, I thought it had something to do with ROT13. Then there is an attachment to download. Let’s see what’s in it:

U_E}M28NWV5?28S~

I tried to decode it with ROT13. I used Cryptii.

Cryptii

H_R}Z28AJI5?28F~

After this point, I was stuck for a while. Then I searched for clue in the challenge description. 

Remember? It said touch typist. Then searched google for “touch typing cryptography” and “touch typist cryptography” 😑. The results that came up weren’t that useful. 

Then it came to me for a second what touch typist meant actually. I searched for “keyboard encoder”. Then I found keyboard shift cipher.

I used the decoder from our old friend decode.fr

Found It😥

We found: DSC{V17_QU4L17Y

It’s missing the end bracket. Wrap it around with the flag format and submit. Voila, 100 points.

FLAG: DSC{V17_QU4L17Y}