n00bzCTF - Writeup

Challenge: Vinegar

• Category: Crypto

• Points: 100

Challenge Description:

Can you decode this message? The challenge provides an encrypted flag and a key:

• Encrypted flag: nmivrxbiaatjvvbcjsf

• Key: secretkey We are tasked with decoding the encrypted message to reveal the flag.

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Solution:

This challenge uses the Vigenère cipher, a method of encrypting alphabetic text by using a simple form of polyalphabetic substitution.

• Search online for Vigenere cipher decoder and input the enc flag and the key

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Result:

• The decrypted message is: vigenerecipherisfun.

Flag:

The flag is: n00bz{vigenerecipherisfun}

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