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HACKvent 2015: Day 4

07 Dec 2015
CTF: Hackvent 2015
Link to challenge: http://hackvent.hacking-lab.com
Date Completed: 07 December 2015

Challenge

Solution

At first I was convinced this was a Vigenere cipher but this is not the case.
After a clue from M from the hacking-lab IRC channel I was able to figure out the cipher used is the Scytale cipher.
This is somewhat obvious as the -  characters from the nugget are all grouped at the end of the ciphertext.

The length is also obvious by simply looking at the end of the ciphertext, l = 5.

We use an online skytale solver (link) to get the flag.

Flag:  HV15-OWoV-lO6j-Aqq8-fV7M-Oduv

 
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