Cyber Security Research Hub

The Encrypted Sandwich Order

The hacker group ByteBakers has hidden a secret message inside their kitchen logs. They are notorious for leaving encoded instructions for their secret sandwich recipes. You’ve intercepted one of their encrypted messages: a list of numbers. Your mission is to decode the message to find the secret instructions — and retrieve the hidden flag!

The message looks like this:

Encrypted message (list of numbers):
[69, 88, 69, 87, 48, 70, 87, 73, 126, 118, 120, 103, 114, 98, 112, 100, 110, 104, 98, 112, 104, 98, 100, 98, 118, 100, 113, 103, 122, 108, 102, 107, 128]

A small hint is hidden in their notes:

“Each character has been shifted by the same secret number — can you reverse it?â€

decode the list of numbers to reveal the secret flag in the format BUBT-CTF{***}