Crypto 4 - Writeup

Crypto 4 - Valentine CTF 2020


The challenge gives you this strange piece of text

=========gsvuoztrhyzmzmzgsrigvvm=========

The equal signs might be referring to base64, or just for misleading :wink:

Approach

In such cases, most probably it is encoded in one of the popular ciphers, you have no choice other than trying each and every cipher you know!

Finally, after trying a couple of popular ciphers, it turned out to be Atbash Cipher, by just googling Atbash Cipher decoder we can get the flag.