CTFlearn-Writeups/Cryptography/Vigenere Cipher

Vigenere Cipher

The main idea finding the flag is just having knowledge about Vigenere Cipher.

Step-1:

Its very easy if you have basic idea of Vigenere Cipher. If you don't know, please refer : https://en.wikipedia.org/wiki/Vigen%C3%A8re_cipher

So this is what is given in the message of challenge:

The vignere cipher is a method of encrypting alphabetic text by using a series of interwoven Caesar ciphers based on the letters of a keyword.<br />

I’m not sure what this means, but it was left lying around: blorpy

gwox{RgqssihYspOntqpxs}

Step-2:

One thing is important to know that Vigenere Cipher requires a key to decode any message. I used this URL to decode my message and used given key as : blorpy https://cryptii.com/

Step-3:

This was my output:

That's it. That's our flag.

Step-4:

Finally the flag becomes: flag{CiphersAreAwesome}