Vigenère Cipher

We are given this ciphertext:

DETctysy{QzeffcgRgcBhsjdkf}  

And we also have a strange word: blorpy.

Since the challenge is called “Vigenère Cipher”, we can guess that the encryption algorithm is precisely Vigenère cipher, which is a type of Caesar substitution algorithm. To decrypt the message, we can go to CyberChef and use blorpy as key:

Flag: CTFlearn{CiphersAreAwesome}.