Problem: The one time pad can be cryptographically secure, but not when you know the key. Can you solve this? We’ve given you the encrypted flag, key, and a table to help UFJKXQZQUNB with the key of SOLVECRYPTO. Can you use this table to solve it?.
File: THE_FILE
Solution: Its a Vigenère cipher. UFJKXQZQUNB becomes CRYPTOISFUN after using the given key.
Flag: picoCTF{CRYPTOISFUN}