The Science of Codes: An Intro to Cryptography

Were you fascinated by The Da Vinci Code? You might be interested in Cryptography! There are lots of different ways to encrypt a message, from early, simple ciphers to the famous Enigma machine. Michael Aranda takes you through a fun and cryptic episode of SciShow, all about codes!
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Sources:
www.simonsingh.net/The_Black_C...
book.itep.ru/depository/crypto...
www.cs.trincoll.edu/~crypto/hi...
www.sans.org/reading-room/whit...
ftp.stmarys-ca.edu/jsauerbe/m1...
www.turing.org.uk/scrapbook/ww...
enigma.louisedade.co.uk/howitw...
www.codesandciphers.org.uk/eni...
www.pbs.org/wgbh/nova/military...
www.cs.miami.edu/~burt/learnin...

[@TheYafaShow]

Two cryptographers walk into a bar. Nobody else has a clue what they're talking about.

[@ShallowBeThyGames]

***** Who'd have known a cryptographer would be scuppered by predictive text.

[@stuvs830]

@Ka P that took me a sec.

[@TaylorYarick]

+Stu VS I'm not gonna lie. I don't get it

[@user-nf3hh8kn5r]

+TheYafaShow lol i got it in less than a minza

[@TaylorYarick]

I get Ka P's joke now. I thought you'd all like to know that. It only took 3 months

[@scabiniful]

passing notes in class just got a lot more interesting

[@afeishalopez4524]

hahah😂😂😂😂 true

[@Combes_]

@@xingyuliu1890 i bet they won't when they don't get caught passing test anwsers because they used the cipher

[@erlynvasquez1962]

I gave this to a crush I had

[@bitonic589]

hah, ik this is from 8 years ago, but imagine a teacher so confident aboutta bust a student, but then seeing "faojnfb hbba klpp hanv kkso"

[@l_e__m___o____n_____.]

Thanks for the idea

[@NukeIvex]

When you crack Caesar ciphers, do they ask "Et tu, Brute force?" Hides from impending mob.

[@AplaTaSpaw]

Kevin Xue Oh man exactly my kind of humour...well played :D

[@Leah-xe6xs]

Huh?

[@dominic2446]

i dont get this.

[@SomeBuddy777]

You don't get his story!

[@sureshotshorts1207]

Haha man....!

[@d.tt.wilding7740]

he's telling me this so enthusiastically like if he's helping me get away with a top secret. I almost feel bad for having nothing to hide

[@govindagovindaji4662]

LOL~!

[@MetaBloxer]

"This should look like gibberish to you" *Gestures towards ad*

[@apersonthatisliving5810]

MetaBloxer nope

[@carpenter3461]

lol

[@squee6970]

Brute force is pretty effective on Caesar

[@nicholasdreesen3223]

even a brain could be decrypt caesar xd

[@maron3563]

agree :D

[@maistromann136]

I understood that

[@vanillatwilight82]

I just screamed this is too funny i hate it

[@TheMultipower47]

Too soon

[@manguy01]

I learned the Caesar Cipher in 4th grade. My teacher was awesome. _edit: 5th grade._

[@SeaZucchini]

***** For 8 year-olds. That's kinda... I dunno, the point?

[@batman88891]

Matthew DeLeon Most fourth graders would be 9, wouldn't they?

[@GhostKreep]

batman88891 nope

[@AkwardCheeseIsAkward]

batman88891 Depends on where you started.

[@QuickLs3ns3]

MicManGuy Wtf SciShow i rewatched numberphiles videos about the enigma machine and then 3 hours later u post this video about Cryptography.. Are u spying on me? Spooky

[@chaz8837]

Enigma is a truly brilliant approach to cryptography. The weakness is the common wording of course. So we can take common words out of the cipher altogether. When using enigma one must not use common words at all. so we can make different substitutes for common words like "the"

[@JamesDavy2009]

Or »das«, »der«, »die« and »Fuehrer« back when they operated them. In fact, Enigma messages began with a three-letter operator code (at first repeated once to make a six-letter operator code).

[@gecsus]

The answer is too simple. Simply group all the words into 5 letter groups and there are no common words to find. It comes out like this "thisi sames saget hatus esfiv elett ergro upsin itfin" It's just not translated for clarity. If you can't read it, it says "this is a message that uses five letter groups in it fin."

[@himesilva]

@@gecsus That somehow seems too obvious. Would it really work?

[@gecsus]

@@himesilva It actually is used by military. When a message is encoded it must be grouped into 5 letter groupings so that the common word sequences are not obtainable. Otherwise it would be easily decoded. Could you even recognize the message example even though it wasn't encoded? The next problem is letter frequencies. Like "E" is the most commonly used letter in the alphabet for English words. Words like it, we, us, be, etc, are limited in number. Single letter words a very easy as well, as they are VERY limited in number (I, & A)

[@Suedocode]

No mention of public/private key encryption (RSA/ECC) or the current symmetric key encryption (AES)? The schemes you provided are technically symmetric key encryption, and it's such an important word/concept that I'm surprised it wasn't specifically pointed out. RSA, ECC, and AES are the most important and relevant encryption schemes. A topic about cryptography is rather silly without them, even if it's only rudimentary stuff. You don't need to describe the math behind it, but mention the concepts at the very least.

[@tipomartins]

Jeremy Joachim I think they will do it in future videos, this was just the first part!

[@RSP13]

Jeremy Joachim It's better to present properly just a few topics then to simply scratch the surface of several ones. I would be pissed if they attempt to explain RSA is 30 seconds.

[@thegingersheep]

Jeremy Joachim While I understand the reasoning behind what you said I have to say I partially disagree. While it is true they could of gone into more advanced/modern encryption methods. This show is primarily intended to provide and introduction to topics. This allows those who are interested to explore additional information and those who are not interested to learn some and then move on.

[@filipepontelima8305]

Jeremy Joachim This video was clearly only about the history of cryptography. It's very complicated to explain all that for everyone and expect it from an 8 minute video is unreasonable. But the concepts introduced in the video were great and all the information absolutely correct. The only thing that the video could have mentioned is the illogical use of the one time pad: "if you have a secure way to send the secret key, why not send the message itself through this comunication, since it has the same size?" But the video was amazing.

[@Suedocode]

+Filipe Ponte Lima "This video was clearly only about the history of cryptography." But it says "The _Science_ of Making and Breaking Codes". This is like titling a video "The Science of Light" and then talking about aether the entire time. "if you have a secure way to send the secret key, why not send the message itself through this comunication, since it has the same size?" You can hand them an enormous one-time pad in person once, and then have secure communications thereafter. It's much more preferable than handing them messages in person every time.

[@theoneshad0w508]

How about a crash course series on this? Like if you agree.

[@DampeS8N]

Very nice primer on encryption with examples. Great job! I hope you do a part 2.

[@Imedge6]

One of the best interesting episode ever !

[@Flashzinh0]

Mat G For sure !

[@stevie-ray2020]

Despite the fact that hours could be spent explaining the cracking of codes, this is an excellent and concise explanation of ciphers and deciphering!

[@resisx07]

Mat G " "Cribs". HA !

[@rich3of3]

Mat G yes, I agree

[@stevenroyalton7789]

Mat G One of the best interesting grammar ever !

[@laurafleming4377]

You should cover quantum cryptography - it's actually unbreakable

[@NearlyInfinity]

It is to current regular computers but not so much to other quantum computers

[@RevolutionibusOrbiumCoelestium]

Laura Fleming - Actually that’s incorrect. Quantum cryptography is easily breakable with other quantum computers.

[@NearlyInfinity]

@@RevolutionibusOrbiumCoelestium Only as much as current encryption on normal computers is to break on normal computers, but quantum cryptography is un breakable to regular computers which I think they are talking about

[@onyanchamotanya973]

The dai I saw a chain break through a tarmac road I knew everything is breakable

[@filipepontelima8305]

I work with cryptography and I have to say: this video is amazing. Great way to teach the history of cryptography in a way easy to understand. Also very accurate and covered the most important topics of the history of cryptography

[@lunam7249]

your comment was very clear,...i doubt your a codewriter....hahaha

[@NotronLP]

6:16 There is a movie about that called ''The imitation game''

[@annashklover3023]

That's my favorite movie!

[@Adjuni]

Love that film. Made me really sad how they treated Turing after the war. :(

[@beecomesover]

yeah, watch 2 times and still love it though

[@grantreynolds_1]

Fantastic film

[@fairlylocaldreamer7917]

Yes! One of my favorite movies ever!

[@Gruggo]

This was an incredibly interesting episode, I ended up spending at least an hour reading about encryption and hashing after watching it. Very, very interesting indeed.

[@SittingGuy]

This stuff is way too advanced for me. So I'll just keep sitting on things :D

[@Mazzolli]

Sitting Guy do you babysit?

[@willlegok9]

This is extremely simple.

[@Leitilumo]

What...?

[@perspectivedetective]

***** Ok, I don't know if this will work, but it's the only thing I could find: First, hover your mouse over the user's profile pic. That should bring up the google plus hover-over menu. Click on the little 'g+' logo to go to their google plus profile. Once there, look for the little down arrow below their profile pic/circles info on the left side of the page. Click the little down arrow, and you'll see "Mute (user)" and "Report / block (User)" options. I don't know exactly what muting a user does, but it might be worth a try.

[@ellmuffin]

I admire your honesty. Everyone, listen, Sitting Guy for President

[@Kneedragon1962]

It may be worth mentioning that the 'Bombe' made by Allen Turing and Tommy Flowers, was in many ways the world's first real electronic computer. It predated the American Colossus computer by about 4 years, and inspired it. Subsequently, Von Neuman (who had worked on Colossus) made a set of recommendations, should anyone attempt to build another one of these things. His recommendations led to the building of the first Von Neuman machines. All modern computers could reasonably be described as Von Neuman machines, because 75 years later they still comply almost exactly with Von Neuman's recommendations. Codes, specifically the Enigma, gave birth to modern computers. And, much as the NSA may annoy us, without espionage, there would be no computers.

[@EcceJack]

This was a very nice overview for those hearing about this for the first time - but also a nice summary for those of us who have heard more about some of these methods (especially Enigma), but really don't mind being reminded of the *big picture* every now and again. So all in all: great job! :)

[@shattywack]

Never really gave this subject any thought before. Man, I love this channel

"When websites announce that hackers know everything about you, that's because their encryption methods were breakable" That's not true. Most of the time the website are broken into because of unpatched or misconfigures software. It's extremely rare to be hacked because of a flaw in in the encryption methods.

[@PirateTHESteam1]

Toni Lähdekorpi Well, you are partially right. You see when you hack a website you usually retrive a database filled with information. The information in this database can often be encrypted, so if you want to be able to login to lets say one of the admin accounts, you'll have to decrypt the usernames and passwords first. The method of encryption varies greatly from AES to no encryption(plain text).

[@isaackarjala7916]

PirateTHESteam1 in the case where an encrypted database containing passwords or credit cards is stolen, they advise changing your password and credit card out of an abundance of caution not because they believe that there is a credible risk of cryptanalysis cracking the crypto.

PirateTHESteam1 If they access your servers and database, they will most likely also gain access to the code itself and the keys required for decrypting anything decryptable. Passwords aren't (or shouldn't ever be) ecrypted with anything other than a one way hash that by design can not be decrypted, but rather the password is always rehashed and compared to the stored one on login. But even with the decryptable data, the problem isn't a flaw in the encryption itself.

[@Fenriswaffle]

PirateTHESteam1 So if I encrypt all the passwords with MD5 I'm safe rite? I'm kidding. Though I have to ask, if say for instance you DO have a database where the passwords are encrypted using MD5 for whatever reason, would it be possible to switch to another algorithm and update the password rows accordingly?

***** Yo dawg, you could always hash the easily brute-forceable MD5 hash and then remove the MD5 part on login.

[@GelidGanef]

Crash Course: Cryptography & Cybersecurity? PLLLZZZZZ!!!

[@catebrooks6779]

Possibly the best SciShow episode ever... brought me back to reading Cryptonomicon. Good job!

[@only20frickinletters]

2:50 Thank you for reminding me that this is a thing. I have rewatched it and smiled.

[@IronDruids]

Seems to me you can get the same effect as an undecipherable code without it actually being unbreakable. Letter shift the message with the Caesar cipher, code the end result with the polyalphabetic cipher, and then use whatever other ciphers you so choose on top of all that. It should be such a momentous hassle full of trial and error while trying to figure out what ciphers were used that by the time it's decoded, the message is already unimportant with you being long gone and the scheme already accomplished. You bury them under so much busy work that you can do whatever you want in the meantime completely unhindered. Unless I'm misunderstanding how ciphers work?

[@FalbertForester]

You're right in separating "undecipherable" and "unbreakable". Most modern cryptography schemes are sets of rules that are fairly simple for computers to implement. As of yet, most of them are not proven "unbreakable", just "we think that these aren't decipherable in a reasonable amount of time". Which can be "good enough".

[@Seraphii874]

It's so weird not seeing youtube views freeze at 301 anymore O_o

[@manurmad1539]

Has it really been 4 years since that was a thing?

[@Needformadness2]

@@manurmad1539 longer actually

those were the days

[@cheerios428]

This video is great! My girls who code class is doing our Cyber Security/ Cryptography unit this week and this is such a perfect video to show them! Thanks SciShow!!!!

[@marciparks3377]

Wow Michael! I really love how into detail this episode is.

[@AdvosArt]

It's funny cause I just watched top 10 memes top 10 facts gravity falls and at the start he talked about codes

[@amadoudiallo8557]

Omg, me too i was about to comment that lol

[@Digging4AnswersOfficial]

Oh gosh same here...

[@neutronstar6739]

Same

[@stevenroyalton7789]

Holy shet a combo breaker oppurtunity! Jk same here so we are all part of this internet genius club that subbed to Lemino and scishow

[@Acq49]

my brain hurts

[@lfmm97]

This was one of the most interesting episodes so far. Great job.

[@Kio_Kurashi]

I've made several cyphers most of which were variations of the basic ones such as Caesar's. Two of which I'm somewhat proud of. The second one is newer and not yet refined but the first one operates as such: You pick a two digit number. In this case we will use 27. Now we write out the alphabet in order in a line. Using the number of letters in the first word of our message as a key we write the 10's digit out as many times as there are letters in the word above the alphabet. Continue in this pattern going up in numbers. So 3, 4, 5... Once you have finished on top we take the one's digit and work are way down. In this case 7, 6, 5, 4... The difference here though is that we are skipping letters equivalent to half of the key rounded up. You still use the number the same amount of times. Using the top number you will create groups of the same number which would give you different numbers on the bottom. If we were to encode "This is easier than expected." then you should have something that looks like this: 2222 3333 4444 5555 6666 7777 88 abcd efgh ijkl mnop qrst uvwx yz 5375 3753 7527 4264 2642 6416 31 We now put the groups in order listing the lower numbered groups from lowest to highest. in this case we get yz qrst efgh mnop abcd uvwx ijkl. Now we take our original number which will become our second key (and a guide for the receiver) and count through all of the letters that number of times.what we land on we then take out and use for our letters in order. I.e: ABCD EFGH IJKL MNOP QRST UVWX YZ ZREM BXSA LCFK IJTP GQOH UWDN VY But there's more! Capitol letters get shifted to the left by a factor of the first key (the letters in the first word). This means that instead of the 'T' in 'This' becoming a 'H' it becomes a 'P.' Fully translated it goes as follows: "This is easier than expected." "Palo lo bzolbq hazj bnpbehbm."

[@YUSOMEAN]

New and better cyphers, drop some hot bars, bruv

[@kathyphilip7925]

Gotta love Alan Turing!

[@israelch100]

I just watched the imitation game yesterday, and this question was in my head the entire day, thanks guys!

[@JoeBribiesca]

INDEED, ONE OF THE BEST EPISODES OF SCISHOW YET! Way to go, team! And way to host, Michael!

[@EvelynDayless]

When hackers get data it's usually because either they got access to the decrypted data or the company didn't bother encrypting it at all. They don't usually break the encryption themselves.

[@glorvalmacglorvas171]

Here is how to make an unbreakable code: Write down random letters and just remember what you meant. :D

[@jpeg1991]

Just want to say, i love this show. Keep up the good work guys!

[@oceannuclear]

The animation team has done a great job on this one!

[@MagicTurtle643]

Wow, great episode. I was rapt the whole time.

[@kroen]

If every cipher can be cracked with enough time and determination, then how come no one has yet to crach the voynich manuscript? that book has been around for over 600 years and countless people have tried and failed to crack it.

[@Andytlp]

Kroen Redstone the only logical answer is.. it's plain gibberish. I can tell cuz there was illustrations of people having sex. In a herbal journal of some sort. Lmao.

[@1serhiy]

Kroen Redstone people at harvard uni studies the book and noticed that most of the words inside the book are too long to form a coherent and useful language, therefore they concluded that the book is gibberish and have created a way of mimicking the gibberish via a set of rules.

[@isaackarjala7916]

Not every cipher can be broken, one-time-pads are mathematically impossible to crack if implemented correctly, several other algorithms might also be impossible to crack when implemented correctly, but that hasn't been proven mathematically. Also, you can't translate a language using only the written language.

[@Darticus42]

tulp35000 Maybe there's some secrets the author really didn't want people to know about ;)

[@thatguyitzme5725]

Kroen Redstone jibberish

[@sakeneden]

This is a superbly explanatory and interesting video about cryptography. Good job!

[@esscee96]

This was really interesting! :D One of my favorite SciShow videos yet! :D

[@DarthObscurity]

Why do things get brittle when they dry out?

[@eightplusone7512]

Because moisture offer more flexible movements and typically when that happens that means it was already pretty brittle

[@LukeScottgamer]

Thanks Gravity Falls for teaching me this.

[@Phoenixmage50]

lol for me it was the overwatch arg with all that encryption and salted shit

[@Chriael]

Same dude!!

[@TheBigangrytexan]

Fascinating. Thank you for the video!

[@CSGDuncan11]

Great episode! This was my favourite so far!

[@MosukaDreamer]

The guy from Vsause is named michael. Coincidence?

[@godqueenbidoof]

This was great I wish you had talked some about Steganography though, which amusingly enough google chrome's spell check doesn't recognise as a word XD

[@EvelynDayless]

Jeff Cyr Hmm, it does for me.

[@godqueenbidoof]

Munashiimaru Really? I guess it's cause I have it set to UK english then

[@General12th]

Jeff Cyr Chrome spell check doesn't recognize a lot of the technical words I use, like "apoapsis". I'm not sure why its dictionary is so limited.

[@heinrichthurston6961]

***** I only know that word thanks to Artifexian. The math may not make sense but it works.

[@Fenriswaffle]

***** Uncommon word perhaps? Usually peri/apo are in reference to peri/aphelion which isn't common to begin with. Also I learned peri/apoapsis from the same place most people did.

[@Tryangetbetter]

Fantastic video! In my third year of university we had to encrypt a message using any combination of substitution ciphers, Caeser shifts, Vigenere, and affine ciphers before then decrypting each others ciphertext. If our message got decrypted we lost marks and we gained marks by decrypting other peoples messages, it was a fun piece of coursework, especially after making a document in Excel to do all of the manual work for me :D

[@SlyPearTree]

Nice episode. I didn't learn anything but cryptography is always an interesting subject. Can't wait for the promised follow up.

[@jk844100]

Actually the Polish cracked the enigma code first.

[@tomshraderd4915]

jk844100 Yes, it was mentioned in the video at 6:53 under the picture.

[@videogyar2]

***** The british havent decoded it fully either. In the movie The imitation game its highly overrated.

[@TheApollotd]

The polish cracked enigma (easy) Alan Turing (British) and his machine decrypt ed the code out of 159,000,000,000,000,000,000 possible combinations that kept changing every day

[@habiblevi5369]

***** The original Enigma machine landed in a Polish customs office courtesy of Berlin. It was promptly followed by a German official claiming the crate had been sent by mistake, and to return it immediately before passing through customs. This aroused suspicion, so the customs officials took the crate apart and photographed everything they could so that a working model could be reproduced. This was in 1929, by 1932 the Poles had developed a working model and were able to decode messages, but in 1938 Germany made a new and improved model that was no longer breakable in the same way. Poland was able to smuggle all their work to the British just before they were invaded. Without that lucky circumstance, and Poland's hard work, Enigma may have never been broken during the war.

[@Quadsie]

But Britain can into space

[@tuxino]

I'm not really concerned with North Korea reading my email - and unless you're doing sensitive government work and and have documents related to that in your email, you probably shouldn't be either. A whole different concern is my own government or other organizations working within my country.

[@copperjaguar]

Exactly, true

[@StreetKingEvolution]

Agreed! One of the most interesting episodes yet!

[@Robot_Overlord]

That was one of the best ones yet. Keep going

[@ColtaineCrows]

More interested in keeping the USA out of my e-mails to be honest.

[@sunofslavia]

"Nice Things About Hitler" that's a pretty edgy post-punk cold-wave band name.

[@gffypopcorn123]

THIS!! Please do more like this!

[@gnuPirate]

Fantastic video, really enjoyed it, learned a lot in a short time. Thanks Sci Show.

[@vincensiusa4578]

use encrypted klingon

[@TomKellyXY]

While the Enigma was cracked, the Germans never managed to crack messages from the New Zealand WWII troops who spoke plain unencrypted Te Reo Māori into the Radio

[@IwulikeLOLZ]

+Tom Kelly lmao the axis couldnt really crack any first nation languages. So when they intercepted messages usually coming from the commonwealth they didnt know what they said

[@IwulikeLOLZ]

+Tom Kelly lmao the axis couldnt really crack any first nation languages. So when they intercepted messages usually coming from the commonwealth they didnt know what they said

[@IwulikeLOLZ]

+Tom Kelly lmao the axis couldnt really crack any first nation languages. So when they intercepted messages usually coming from the commonwealth they didnt know what they said

[@vlchltsemsdbscrlbrs8624]

you are looking

[@MukaMoko]

Would the Rosetta Stone be considered as an unbreakable message?

[@ShaudL]

Um no.... I'd think not at least. I mean we have most of the languages on it learned and we did that by analyzing surrounding languages.... With some time given it'll be broken

[@departmentofeducation7212]

Primid King He wasn't talking about the language learning program, he was talking about the actual Rosetta Stone, which helped us understand the hieroglyphic writing system of the Egyptians.

[@ShaudL]

+Malboro Overking so was I 😂😂

[@ShaudL]

+Malboro Overking so was I 😂😂

[@ShaudL]

+Malboro Overking so was I 😂😂

[@joettaxoxo]

This was the coolest video! Thanks SciShow

[@wow5212]

Tips for simple but effective encryption (can be programmed in python) : 1) Include spaces, commas and dots in your alphabet list as 27, 28 and 29 respectively. 2) Carry out alphabet substitution. Example : a - t, b-k, c-s ...... 3) Then, apply vigenere cipher with long key. Example : "thispasswordissohardnobodywilleverguessit" 4) Don't use capitals. It makes it MUCH easier to crack. Your end text will be completely gibberish with random dots, comma and spaces. There will be no common word lengths such as 3 for "the", 1 for "I" and others.

[@franatrturcech8484]

the problem is that you can only encrypt text, and with a long enough message, even frequency analysis can still be done. there is no diffusion, the mapping is still 1->1

[@rowboogs1]

My brain just got brain fucked.

[@KarasGamer]

same here

[@cldream]

Oddly enough, there's a language called Brainfuck. ;P

[@przemysawzych1866]

I don't understand why it is so common in English programs/films not to mention about three polish cryptographers who decoded Enigma before Turing. You should have done your research more reliable.

[@luckynater]

source?

[@przemysawzych1866]

+luckynater BBC for example. you can dig deeper but this source seems easiest and still reliable. www.bbc.com/news/magazine-28167071

[@someperson5506]

Didn't know that. Thank you :)

[@dmitrixallo7072]

Because the UK want to glorify their 'Great' country, which is falling apart, and good that was made by other countries, they will take it, whatever they did bad, they give it to other countries. Pozdrawiam

[@leonard_4083]

Awesome video! One of my favorites in a while :D

[@ma6inka]

One of the best episodes ever !

[@008abdullah]

Brilliant episode, absolutely loved it

[@bbpoltergeist]

This was amazing ! I would love to see more videos regarding cryptography.

[@ZachTheGreek]

Seriously cool episode. More long form stuff for sure.

[@WilkerLucio]

great video! thanks for all the hard work.

[@ramadanhasani]

This video was great, really enjoyed and learned something awesome.

[@crazyd3mon968]

I had trouble understanding the vigenere cipher before watching this it's really helped me to make sense of it thanks. Edit: Just used a vigenere cipher to test my friends hopefully I did it right

[@HalcyonSerenade]

Aw, I was actually hoping for some of the newer, digital encryption information! Fun stuff regardless, though. Frequency analysis would've been my go-to for the standard Caesar cipher, but being able to apply it against a varying rule is fascinating. Human ingenuity is astounding.

[@Lorbeary]

wow! great episode! thank you!

[@Atronin]

yes please do a part two i am super interested.

[@Jollofloff]

Best video in quite while! :)

[@EqualsThreeable]

Very well done episode!

[@PrimalBeard]

Well done on this episode!

[@athief]

Really cool! I'd like to hear more in details from you about this :)

[@jasong5913]

Excellent. Well done.

[@voINNOCENTov]

Sick episode man. Kudos

[@kanz831021]

Excellent episode! Great !!

[@JohnSF93]

I learned to use the Playfair cipher a couple of years ago. Very simple to use, and very hard to crack. It's still possible to do letter pair frequency analysis, but you need a really large ciphertext to even get started

[@vitalymilavsky9451]

This was a great episode, please make a follow up

[@sunni6610]

I love this channel so much

[@ozzyfromspace]

Awesome presentation!

[@brandan4375]

Awesome episode!

[@jessiebullock]

Super interesting! Thank you!

[@RonN448]

Absolutely and utterly fascinating. But, I think my mind blew a fuse!

[@recordingice4388]

Well spoken and informative :) Good video, thumbs up.

[@ardalanhusin1726]

very useful and short tips a bout encryption, well done

[@draxquirnon6809]

Great video Michael!!!

[@favian95]

The logic is so simple and yet the execution is so complicated

[@bakes5643]

ive been trying to search for a while but can someone explain how one-time-pad encryption is used / how to use it (eg encrypting text that you have written on a piece of paper?)

[@arcclite1144]

I work in healthcare programming. Cryptography up a lot, it's nice to see a SciShow video on it!

[@lmjr0419]

awesome episode!

[@Bynming]

More about this! Good stuff :)

[@misschelz1]

omg Michael Aranda!! It's been ages since I've seen him !