YubitSec CTF - A Fine Cipher - Warmup

Problem

a:9 b:13

Encrypted: VLWHCTXF{N_GHAX_FHSYXK}

Solution

The problem description was a hint that the message is encrypted using the Affine Cipher.

Using an online tool to decrypt the message returns the flag.

FLAG: YUBITSEC{A_FINE_CIPHER}