 Is everybody having a good day? That's awesome. I'm so glad to hear that. I had no idea how cool roots asylum was but you people have drone wars in here That's amazing encrypted relay race. That's wonderful I'm here to talk to especially the kids today about how to tell your friends about crypto. I Would love it if each and every one of you had the chance to teach one other person about Encryption about how you communicate with somebody else and feel safe doing it who wants to learn about that today That is amazing. I'm so glad to see it Can we get especially the little kids up a little closer to the front? You're gonna get a chance in the next 10 minutes to solve your own small crypto puzzle and learn how to teach your friends about Cryptography, okay, come on up. There you go. Just sit down right here. We're good All right Come on on up. I have a faithful assistant today My awesome brand-new husband deviant and he's gonna do us a favor and pass out crypto puzzles to the kids up in the front So hi, I'm Tara I do stuff here at Defconn and I'm gonna show you how to use a game I learned when I was in elementary school to teach other people about cryptography. I Was kind of a nerd and I like to play games too So this is my natural home folks All right, I like games of every kind of every stripe I love poker which makes Vegas pretty fun and happy for me and I Learned about six or seven years ago more about cryptography than I thought I'd ever have to I don't do crypto normally Actually, most of the time I run a security operation center or I do incident response and in security That's about doing stuff fast sometimes crypto is about doing stuff fun and slow So let's learn a little bit more about it Who knows what cryptography is best guess with one word? Best guess What is it? Wonderful, it is the study of coded messages. That is fabulous. What does crypto mean? It means a secret right means something that you don't know Cryptography is just a secret that you and someone else have put together so you can hide a message and then unhide it Right good Does anybody up here know what this crypto is right here? You ever seen it before? Come on. I know you know Caesar cypher. It's one of the oh, I heard a kid's voice back there shouting Caesar cypher Come on up here and sit down. You're gonna get a crypto puzzle in a minute All right, this is a Caesar cypher the easiest way to explain to your friends what cryptography is is a Substitution cypher right when one letter of the alphabet means a different letter of the alphabet It's really easy to understand and it's something. I'm gonna show you how to do today. Okay? Does anybody in here know what rot or rotate 13 means if a Caesar cypher? Oh go bring it Yep, and you add 13 to it. That's wonderful. So in rot or rotate 13 What is the letter a equal does anybody know? M awesome heard a little girl back there. Come on and sit up at the front if you'd like to That's right And a equals an M in rot 13 and you're all gonna get a chance to do this kind of puzzle in just a minute This is what it looks like. It's why we call it rot or rotate It's just a wheel of letters just like this And if you want to you can look those up on your phones right now or any machine You have in front of you and pull up a rot 13 alphabet. Okay? You want to play along and I highly advise it Does anybody know why people in crypto at crypto parties who are kind of nerds like to joke about rot 26 What is a in rot 26 the little girl back here? It's a bravo. Awesome. I'm so glad you said that that's why it's funny, right? If you encrypt something with rot 26, it's just the alphabet again, and it's really funny Very good. You can come to my next party Does anybody know what this is it's a box you can open and it's called a Anybody know Adults are allowed to guess on cryptics. Awesome. Yes, didn't even require an adult on that one a cryptics It's a box you can open by understanding a substitution cypher just like this one That's just what your locks are on your lockers at school by the way not that I'm giving you any hints That's my husband's job. He'll teach you about locks and breaking into things in a little bit Does anybody know what this is The secret to cryptography is never being scared of it This is called a vision air cipher and this is just where cryptography went over the last several hundred years But the basis of all of these secrets is just knowing that one letter is gonna stand for another letter. Okay? Sometimes you need a secret in crypto to be really really strong So if all you have for information is just one letter and another letter sometimes you add in something That gives your cryptography a little bit of randomness. What is that little bit of chaos called? Does anybody know? You use it with pepper Salt exactly you add a little bit of randomness and then you get something that only you and somebody else can unlock Who's played this game before mansion apartment shack house? This is so great I did this talk yesterday for a crypto and privacy village and almost none of the boys got it there all the girls played match Mansion apartment shack house when they were in elementary school And if you are like me you counted in advance backward in your head to make sure you ended up with Bobby from the third grade So this is a game that lets you show people how cryptography works It rotates in a circle and you pick out and eliminate The different choices that you have after you set yourself up with porches and mansions and fun stuff like that You do it by drawing a spiral circle until someone else who's not looking says stop and you count the rings The number of rings outward is how many times you go around the circle, right? So you have your randomness you're going around in a circle and you're eliminating choices until you end up with a final sentence I live in a mansion with Bobby and I drive a Porsche and I still have student loans which most of the adults would get All right So here's the question This right here is the opposite of a Caesar cipher. Okay. It's a x plus three a Equals the letter that you're going for plus three if a plus three is our crypto. What does x equal? What is the letter you're gonna get? Best guess It's the opposite. So if a D is an a and a Caesar cipher. What is an a in the opposite? It's a D. Good. Exactly Now we understand all cryptography is is just adding stuff to this equation until it gets so complex that people can't guess it Really easily then you add the randomness in so that computers can't guess it really easily, right? exactly Now we have a secret one person has and another person has in just a second You're gonna do your own rot 13 translation But I want you all to realize the only thing cryptography is when you explain it to your friends and please explain it to your Parents too. It's just an equation that lets you translate numbers and letters. Okay Sound pretty fair not scary at all. In fact, it's a lot of fun for puzzles and games So as you're sitting at your computers I want you to recognize that all you're doing is just letting your computer translate a secret for you So for all the kids up here who want to try their own puzzle I'm gonna ask deviant over here to pass out the small slips of paper. You already got does everybody have a slip of paper that Wants one Everybody's got one that wants one Okay, I would like you if you don't have a rot 13 alphabet pulled up on your phone or your computer to share With a friend and translate the secret that I gave you all right I don't know you but I know what code you need to use and so do you so give it a shot The first person that calls out what they're what their secret is and do it by yourself without your parents or with your Friends the first person that calls that out gets the raspberry pie. I just one for knowing comic book stuff What is it? Road trip we have a winner of an apple pie. Let's bring it Apple pie wait. No, that's a raspberry pie. I'm hungry. I need apple pie really badly congratulations Keep translating now. There's more prizes. All right come and talk to me later on if you want to try to translate a random Rotation, what is something that a random rotation might be right if it was rot 5 What do you think a would be in rot 5? II exactly that's the answer So I would love it if you come up and get more advanced puzzles and try it out for those of you that haven't tried crypto puzzles before Try a site called rumkin.com and try translating it in all the different rotations you can find This is all cryptography is it's how you keep those messages safe and secure. Yes. I'm sure and The thing I want you to remember is that when you get the chance explain to everybody that you know Crypto's not magic It's just a little bit of math and a whole lot of trust and the ability to talk to people and feel safe doing it You all get the idea Yes, awesome. I am so proud ask me anything you want to know I don't do this for a living I just kind of get it and if you want to know these puzzles It's a great idea if you want to grow up to be hackers to know a little bit about crypto too. Thanks kids