<- CRYPTOGRAPHY

Vigenère Cipher

1 minute to read

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:

Vigenère decryption

Flag: CTFlearn{CiphersAreAwesome}.