Rail Fence Cipher

[Flavsditz]

Recently while taking part in a CTF I had to use the Rail Fence Cipher. I've realized my favourite tool (yes it is CyberChef) didn't have it so I decided to contribute it.

The cipher itself is quite simple. For more infos https://en.wikipedia.org/wiki/Rail_fence_cipher or check this site where you can visualize the cipher in action http://rumkin.com/tools/cipher/railfence.php

[claassistantio]

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Thank you for your submission, we really appreciate it. Like many open source projects, we ask that you all sign our Contributor License Agreement) before we can accept your contribution.
1 out of 2 committers have signed the CLA.

✅ Flavsditz
❌ Flavio Diez

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[Flavsditz]

I've initially committed with the wrong user so I rewrote the commit with the correct user (but cannot erase the older commit)