 Hey, what's up everybody? My name is John Hammond. Welcome back to the YouTube video looking at the junior CTF capture the flag competition that was going on last week Another challenge called Southern Cross crypto challenge 300 points. I can show this one off. So they showcase this confederacy cypher disk which Seemingly is a disk that has a specific key that you can encode phrases with just like classic it cryptography So the challenge here is as we encrypted the phrase here it is now encode a famous story and you'll try to code it It's very interesting to read the whole story over. So this link these ellipses is actually a link to a ciphertext You can download so it's just a big text file. So go ahead and download that I'll open it so we have it And it's just words Turn off word wrap Can I do that and? Get it. Wow. Get it sucks. Whatever. Oh, I close it. That was dumb regardless There's this JavaScript thing that allows you to like turn their Version of the thing like left and right. I don't know if they actually Like wanted you to do the challenges way or probably I'm sure it was just a red herring because honestly, they don't do that That sucks and stupid But you get that cipher text. So the idea is to decode it So what I want to do is I want to look up this confederacy cipher disk because I'm curious like okay What is that does it have any like easy online things and I Google it do a little bit of research? So apparently obviously mechanical wheel mechanical disk Created for the confederate stuff in history and things But it's regardless. It's based on the veneer cipher. So okay, cool. Um, I know about the veneer cipher I don't know how it works, but I mean there's totally a bunch of veneer cipher solvers all over the internet So the one that I use almost constantly whenever I find a veneer cipher is the geocaching profile one so Let me get that cipher text one more time. I think it's Let's download it probably sent a really weird in the mic All right, so we can paste this encrypted text in there and it's a big disgusting story And I say I don't know the shift key is so no please try and determine it and figure it out for me And I just tell you code break and this nice online tool doesn't for me I've seen like some stuff with feather duster, which is a cool Module and stuff for cryptography Not okay, not an actual feather duster, but feather does an automated modular crypt analysis tool Which is super cool, and I think it has the veneer some veneer cipher stuff And I've seen others to like some other Python code to break veneers, but they even have some stuff in their tests and examples Yeah, veneer and test bit break veneer. Yeah, veneer cipher text and stuff like that But this online one does it okay, so when I have internet, I'm fine with using this So they find that this key is supposedly boulevard Because it's boulevard repeated over and over and over again, and that does get some plain text I'll try and zoom in here. This is probably hard for you to read 20 miles west of tux in the Sunsets expressed etc. So this is English. So that looks good to me At first glance it would make sense to try and submit the key as the actual flag as usual that is the wrong Idea you should have for the CTF that didn't work. That is not the flag They say very cryptically and discreet in the challenge from don't forget to reach the end of the text The ending is greatly important. So Again a complete guess a complete shot in the dark that I took but if you scroll through to literally the very end of the message There is a notion here That says boulevard cannot carry double and because I just saw boulevard because I saw the key I'm like, oh, I wonder if that is it I wonder if that's the flag and I copied that and pasted it and that was the flag So again, no real notion. I mean, I don't know if he will settle at 185 said Dodson Boulevard cannot carry double. Maybe maybe maybe I should have maybe I'm wrong You know, maybe there should have been more hints and more clues that I completely was blind to but I Submitted that and got the flag. So that's the Southern Cross challenge for the junior CTF This confederacy cypher disc which behind the scenes is just a veneer cypher Which isn't too difficult with an online cracker And if you wanted to I'm sure you can find some stuff in Python or work with feather duster to Do something more automated that you don't need an online crutch for but that's it So thanks for watching guys. Hope you enjoyed on and I'll showcase some of the other challenges real real soon Adios