 Hello, everybody. Welcome back to another YouTube video. We're looking at the CB1 challenge in the cryptography category of Sunshine CTF. So this challenge prop is we picked up a new number station that's been active in the shortwave bands. We need to figure out how to crack his code. Here's an example file, crack the cipher and send us the plaintext message. Okay, so we'll copy this link. We'll go ahead and download it. I've got a directory created for us already. So let's just W get that. Once we've got it downloaded, we can go ahead and run mPlayer on it because it is a wave file. It's an audio file. Hopefully I've got some numbers. Okay, so I'm going to pause it right there, at least stop playing the audio because from right off the bat, I recognize that as the phonetic alphabet. So if you aren't aware, you can check out the NATO phonetic alphabet. You can simply Google that and you should find the Wikipedia article that references, okay, those words that are being said correspond to the appropriate letter. And that's used for communication. Thank you, Wikipedia, for not letting me actually view that in a way that I can zoom in on it. Let's zoom in on the real image. So alpha, bravo, charlie, delta, echo, foxtrot, etc, etc. Those are all referenced in their actual, like the first letter of each of those words going to refer to that letter, right? Alpha is A, bravo is B. And I'm sure most of you will might be associated with that or at least acquainted with it, sorry. So let's go ahead and just take note of it as we are listening. So what I'm going to do is create a second screen and just be able to jot these down and like nano, I guess notes dot text or something and let's go. Okay, so it sounds like that next bit just repeats it and that's all that was left in the file looks like there wasn't a whole lot of time left. So I'm assuming that's what it was. So we have this thing. I don't know what that is, but you may as well bring it through like some analysis. So what I had done is just kind of crank this through a Caesar cipher. You could just go ahead and echo that to rot 13. If you have that installed, just pipe to it rot 13. And that wasn't going to give me anything, but maybe it's some other key other than the like 13 cipher shift. So let's bring it through all the others. Let's do four I in and I'll bring this to the top here for I in 1226. So we can do just we done before echo that right into Caesar, which allows to specify the key or the shift number rather than rot 13. So we can specify dollar sign I there in the variable. So we'll crank through these. And I see one of those is English right away beware the Ides of March. So we would submit that and that should be the flag. We can go ahead and copy that face it in here. And we would that would be the correct flag had I not already solved it. So Katana does do this. We can go ahead and actually specify that if again, the automated rendition of it that at least at the time of recording, I have not yet made public. But I want to keep teasing you with things that it can it can do. CD GitHub Katana. And let's just overwrite that test text file with our input. So we can run let's remove the results file every time. And then run Katana unit crypto crypto on test dot text. And this would go ahead and run through that Caesar cipher. And it will find to be aware of the tides of the Ides of March just like that. So there's there isn't a specific flag format in there. So I wouldn't be able to actually just have Katana find that on its own, unfortunately. But that's why we like to display it also you can look through it as you'd like to. So that is that challenge. Hope you guys enjoyed it. Did like this video. Please do like comment and subscribe. Love to see you in the discord server. Love to see you on PayPal. Love to see you on Patreon. Love to just see you. Let's hang out. Let's go to a conference together. Have a few beers, you know, whatever. I don't know why that's a cultural