He first tries with length 1, doesn't find the distribution he's looking for, so he tries with length 2, then length 3 and so on. Once he tries with length 5, he sees the distribution of english and so he knows that is the length.
You can also break this cipher by looking for repeating patterns in encrypted message. Words like "the" are so common that it is likely that you will happen to get at least 2 the's at the same distance apart as the length of the code word. When this happens, they will be encrypted in the same way, which tells you the length of the cipher.
Two questions: First, what is that little device being used in the videos? And second, what is the relationship with @ArtoftheProblem whose videos are nearly identical, but with a different voice-over?
Yeah they should have explained this better. It simply means adding that number to the current letter when you encrypt the message. The person you are sending it to then subtracts that number.
Please change or lower the background music. It is so high pitch that I not only cannot hear you but it is also very disturbing. It really spoiled the series for me, which are wonderful.
Was confused by the N being 13, even if you're using a mod26 alphabet it wouldn't make much sense because shifting by 4 still wouldn't get you the right answer.
if you have the length of the key, in this case it's 5, you single out each fifth letter (like at 2:07), you're now looking at a single caesar cipher, the 'juicy' data we need, the frequency of letters, can now leak out of this single cipher, you can check it against the chart at the bottom to see what the letter it could possibly be (aka determining the shift), (example: if it shows up the most it's most likely an E) but you must do this for each different letter of snake: aka 5 times. Also just thought of this, another good way to understand is, if you have a code word of all the same letter for some reason, like "EEEE" or "AAA", you now have just a caesar cipher, at least I'm pretty sure lol xD. The caesar ciphers vulnerability is frequency so the polyalphabetic cipher is a way to still use a casar cipher but use multiple different ones in the same message to soften or hide the fingerprint of the frequencies. Hope this helps if it doesn't just reply. The only way I really understand this stuff, grasp it, and ultimately remember it, is if I can help someone else do the same. :)
Cantuğ Çavuşoğlu Yeah something is definitely wrong with their numbers. At first I thought N was 13 because they started counting from 0 but then that would make S 18 not 19.
He first tries with length 1, doesn't find the distribution he's looking for, so he tries with length 2, then length 3 and so on.
Once he tries with length 5, he sees the distribution of english and so he knows that is the length.
I FUCKIN LOVE KHANACADEMY! THANK GOD THAT HE LEFT HIS JOB AND DECIDED TO TEACH THE REST OF THE WORLD!
You can also break this cipher by looking for repeating patterns in encrypted message. Words like "the" are so common that it is likely that you will happen to get at least 2 the's at the same distance apart as the length of the code word. When this happens, they will be encrypted in the same way, which tells you the length of the cipher.
Is there an error at minute 0:31? If all the other letters are 19, 11 and 5 then S should be converted as 14, not 13
Found a mistake in this video.
N = 14th letter in alphabet, not 13th
however, when they shifted E, they did in fact shift by 14 places.
Yes N =14
This new kind video series is just what Khan Academy was missing :)
You are right, it should have been 14.
I am also confused by this.
Khan, this video is in your micro/macro playlist for whatever reason
Excellent video!! Thanks :)
Correction: FSFE RX (N)U PQX(C)ILSM (Y)BVJ
I didn't get the last part. All he got was random letters. How can he determine that five was the length of the shift word from random letters.
Same doubt...
@@PrithaMajumder There was a common change in frequency of 5 every where
@@78anurag How?
@@SB-lh5xbWatch that part again and again or just stare at it, you will get it
@@78anurag bro 😭😭😭
I love learning!
that device is classified! its usually reserved for literate people or kids who want to draw...its called paper.
This is in the Econ playlist just an fyi
Great video, Thanks Khan
I don't think this video is supposed to be in the Macroeconomics playlist...?
Two questions: First, what is that little device being used in the videos? And second, what is the relationship with @ArtoftheProblem whose videos are nearly identical, but with a different voice-over?
This is cool, thanks for sharing these info vids; Jesus Christ Bless yall! :)
Awesome!
What does he mean by "shifting to the number below it"??
Yeah they should have explained this better. It simply means adding that number to the current letter when you encrypt the message. The person you are sending it to then subtracts that number.
@@hattrickster33bro i still didn't understand can u help me out
What's Khan Acedemy's theme song back in 2014?
Please change or lower the background music. It is so high pitch that I not only cannot hear you but it is also very disturbing. It really spoiled the series for me, which are wonderful.
+Transit Analyzer wu.. what?
BOMB! :*
Truly classic
Is it a known truth that there is no encryption algorithm that cannot be broken?
I think you mean "did he make a mis-Snake"!! So in answer to your question, I have no idea...
Mis-Snake=lol
I tried clue 2 exactly as shown in this vid and I still can't get it.
around the 1minute mark, what is the name of the device they are using to code and decode the message?
What does he mean shifting number below it how much the gap he did to get FSFE.....
Any one please help me out
Wait, why is the narrator male in this video but female on ArtOfTheProblem's videos?
A few mistakes on the example is ok, but not in the real world.
This is biblical!
Was confused by the N being 13, even if you're using a mod26 alphabet it wouldn't make much sense because shifting by 4 still wouldn't get you the right answer.
"N" should be 14. It makes more sense
That’s what I’m stuck on, so the video is wrong right? Being it is 14 not 13?
@@hattydaddylive2474 that's righ
wrong playlist!
Lay man words please 🙏
I don't get it because I get the letter N to 14 ?
A=0
Heavyweight thinking.
sir how could be the n is 13th number letter?
E+13 = R not S. Please, check and respond.
Or did he PURPOSELY DO IT?
it should be 19 14 1 11
snakes n is wrong, it is not supposed to be 13, it is supposed to be 14...😅
I didnt get it :S
I gess this video is in the wrong playlist
but I enjoyed it nonetheless :)
Csj f's gdbdgdysyggdgghfs2westdgdgfg\"/:/ /; \,% _,%/%&5#5#%&/6\\5/\%/5:#¿♤♡♢♧》》《
@@njamenawilcox5612 k
8yrs later and I still don't get it.. anyone willing to explain it further??
I got up to half way then ooof
Saw this too. Confused me. Made me angry.
Alright! Now how do I use this to help me solve clue #2?????? Even if the codeword is snake, HOW DO I DECODE IT!?!?!?
if you have the length of the key, in this case it's 5, you single out each fifth letter (like at 2:07), you're now looking at a single caesar cipher, the 'juicy' data we need, the frequency of letters, can now leak out of this single cipher, you can check it against the chart at the bottom to see what the letter it could possibly be (aka determining the shift), (example: if it shows up the most it's most likely an E) but you must do this for each different letter of snake: aka 5 times. Also just thought of this, another good way to understand is, if you have a code word of all the same letter for some reason, like "EEEE" or "AAA", you now have just a caesar cipher, at least I'm pretty sure lol xD. The caesar ciphers vulnerability is frequency so the polyalphabetic cipher is a way to still use a casar cipher but use multiple different ones in the same message to soften or hide the fingerprint of the frequencies. Hope this helps if it doesn't just reply. The only way I really understand this stuff, grasp it, and ultimately remember it, is if I can help someone else do the same. :)
no worries I got it now
@@StanleyZheng care to help me out?
@@johnathanvelasquez1310 5yo comment my friend, don't remember sorry
I have no idea how to decrypt this, please tell me for fuck sake.
Gnar
hahah :D N for 13? you guys first learn alphabeth first before trying to deal with such things.
Cantuğ Çavuşoğlu Yeah something is definitely wrong with their numbers. At first I thought N was 13 because they started counting from 0 but then that would make S 18 not 19.
first comment in two years lol
lol khan academy screwed up
Fuck it! Just create a new language.
Fuck it! Just create a new language.
Fuck it! Just create a new language.
Fuck it! Just create a new language.