Mike Higginbottom

A Digital Garden - frequent growth but a bit weedy in the back corner

PicoCTF Mod26

Created on 2026-05-22

Mod26
Uses ROT13 decryption
Easiest way to solve it is to use the Linux tr command to map the characters in the range A to Z to the characters N to Z followed by A to M, and the characters in the range a to z to the characters n to z followed by the characters a to m.

Steps

1. Download values.txt file
1. Open it and copy the contents
1. Run echo "cvpbPGS{arkg_gvzr_V'yy_gel_2_ebhaqf_bs_ebg13_45559noq}" | tr 'A-Za-z' 'N-ZA-Mn-za-m'
1. Flag is picoCTF{next_time_I'll_try_2_rounds_of_rot13_45559abd}