This is a hacking challenge i made for https://discord.gg/hts.
Network Security Sam's sister, Vigenère Valary, is fascinated by encryption. As her name suggests, her favorite one is the Vigenère Cipher. However, she isn't aware of it's weaknesses just yet. Can you decode her secret message?
encrypted.txt
contains a standard english text, encoded using Vigenère with an unknown key. All characters except [a-z] have been
removed or converted to lowercase. Recover the key used to encrypt the text as well as cleartext. DM the key to Wuelle#9958, extra points
if you also guess Valaries favorite Scifi-series.