 Hey, what's up everybody? My name is John Hammond. Welcome back to another video this time showcasing the Kaizen I think is how you pronounce it the Kaizen CTF. This was a capture flag competition that went on last week Friday I think it was like November 18th or whatever days of Friday of last week There wasn't too many members of my team that was able to like particularly take a look at it It was myself Sam and David so just not not too many other guys, but we actually ended up doing really well We actually came in second place, but it was a small competition So it was designed just for like the state of Maryland But if you wanted to play you could play as like any other college or any other team that you Were playing up as a part of you just needed an edu domain to be able to register So us being at the Coast Guard Academy were okay to jump in And we actually came in second place although we weren't able to win any prizes because we're not from Maryland or anything like that Regardless it was a lot of fun so I wanted to showcase some of it before They brought all the challenges down because they they say they'll be up for the rest of the weekend So you can keep trying your hands at them So I wanted to show off a couple of them in this case. I'll start with the QR nightmare one So this was a just a bunch of QR codes So I hid the flag in the QR code and I don't remember which file it was in so please let me find it So we're given this zip file which we can go ahead and save. I'll just create a new one for Kaizen and save stuff in there and then we're gonna terminal open so we can start to work on it I'll see you into Kaizen and there's our QR codes thing. I guess I'll make a directory for that And now we can unzip this which is straight up unzipped and We have a bunch of QR codes now in this QR codes directory so they're all just a bunch of images of QR codes and It's up to us now to go ahead and extract all of them and try to find which of them have a flag So we just have to determine which one so this isn't too difficult to do I go ahead and use Z bar image Which is a bar career that can work from the command line So we can literally just like slap Z bar image star and it'll try and like extract everything So let's do that. We can use the bar image star And it says okay low enough the flag keep trying blah blah blah and we see a couple of other things scroll by Well, not the flag keep trying blah blah blah So now I'll do this one more time But I'll just actually grep out the low not the flag keep trying to see what else is in there because I see other things rolling by And I'm sure one of them is the flag but there are just so many of these things We'll just do that again And I'll grep out So it takes a little bit of time now because we don't see those low not the flag things coming out It looks like there were other kinds of barcodes in there But hey, we see our flag just pop out we get that Kaizen Python libraries are awesome I don't know what the intended solution for this was maybe there's a Python library for looking at QR codes in fact QR codes Maybe maybe maybe QR code or whatever it is. You can just try and get some stuff out of it But I think a Z bar image works just as well It's just a command line utility and I was just able to just dot star it and then everything just goes and we get our flag Real quick, so you would be able to submit that and it was 200 points So really easy just a simple simple challenge to get 200 points. So cool. Thanks for watching guys again Really simple video. I'll try to show off some other interesting challenges and I'll get back to letting you do your thing See you in a later video