Anti-dcode.fr - Crypto

Task

I've heard that everyone just uses dcode.fr to solve all of their crypto problems. Shameful, really.

This is really just a basic Caesar cipher, with a few extra random characters on either side of the flag. Dcode can handle that, right? >:)

The '{', '}', and '_' characters aren't part of the Caesar cipher, just a-z. As a reminder, all flags start with "utflag{"

Solution

We get LoooongCaesarCipher.txt file containing the long ciphertext encrypted with the Caesar cipher:

To decrypt the text and find the flag we need to find the appropriate shift. We can do that using the following website. We will search for the string utflag{ in the "decrypted" text for each shift. For a shift equal to 18, we find the flag:

Flag:

utflag{rip_dcode}