Mod 26 — picoCTF Crypto Challenge (Easy)

Category: Cryptography
Difficulty: Easy

Description:
> Cryptography can be easy, do you know what ROT13 is?
> `cvpbPGS{arkg_gvzr_V’yy_gel_2_ebhaqf_bs_ebg13_Ncualgvd}`

Hint:
This can be solved online if you don’t want to do it by hand!

Solution:

This challenge uses ROT13, a basic Caesar cipher that shifts each letter 13 positions. Applying ROT13 twice gives you the original text.

The given string is:

cvpbPGS{arkg_gvzr_V’yy_gel_2_ebhaqf_bs_ebg13_Ncualgvd}

I used the tool [CyberChef]to decode it:

1. Pasted the text into CyberChef.
2. Applied the “ROT13” operation.
3. Got the decoded flag.

Decoded Flag:

picoCTF{next_time_I’ll_try_2_rounds_of_rot13_Aphnytiq}