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The decryption key 'd' must be a positive value. -17 isn't positive. In modular arithmetic, a number and its equivalent positive counterpart both satisfy the same condition. Therefore -17mod40 = 40-17 = 23 becomes our decryption key instead.

Extremely well explained. I love how it sounds like a film reel from the 1950s.

Who can Break this uncompressed public key 😂 1btc 1BDvQZjaAJH4ecZ8aL3fYgTi7rnn3o2thE Pubkey 04ea0d6650c8305f1213a89c65fc8f4343a5dac8e985c869e51d3aa02879b57c60cff49fcb99314d02dfc612d654e4333150ef61fa569c1c66415602cae387baf7

31 becomes 5 I don't know!!

Simple, clear explanation. Thank you.

i dont understand how she got the common values from 1=5-2(7)+2(5) to 1=3(5)-2(7) ???

Plz answer it --1lJsySvgkkCE9VFNYVR1sblc4z1YxphmCSF2A38KczfbjLO9xxZPzaSrzIeXZm0r6Fiuxf6AEbCOMgNaECP4Czk39oOYDOeyjmSHtN9ZPAEsHhtbJ05cze5xuJkYnolyD57YI5LnufH3m25Y2Z1p5UNotZdHeo7Hj3uTX88gcF0px4dmS4DLNg2875EaiBHtt4cf2am4

Plz anybody answer it..

Few videos teach about this method however it was a meticulous way to understand it well

Thanks a lot Daniel! This one was very informative. Could you please do a video on monoalphabetic with permutation.

Why is e = 7?

How do you calculate 28^23 using calculate to get decimal. Im getting exponential figures

U explained it well I understood thanx

Your numbers confuse me lols xD for me A=1 M=13, N=14 Z=26, - I would only use 0 if coding with a PC as PC's love to count from 0 on up, but as a Human I count 1 on up, no biggie, if the number is larger than 26, I just subtract 26! "Also" Tip, MEET ME AT NOON coulda been shifted to "T ME AT NOON MEE" Then you cipher and one time pad it lols xD, It's a bit more secure as shifting can sometimes break up words and a single letter at the beginning may look like " I, or A" as EOUY is usually not a word, equally the shift causes a 3 letter word to appear at the end... So then when you Encrypt it, it then looks like 5 separate words, 1st being 1 letter the next 2 at 2, the 4th at 4 and the 5th at 3 letters. Then ofc you would cipher and OTP this. Another way to do this is since there is 12 letters you could also do, "ETME ATNO ONME" and what this does is make 3 words appear as 4 letters each from what would normally be 4 words, then ofc you would Cipher and then OTP it. You can even "Transposition" Cipher this too, As 12 Letters is divisible by 2,3,4,6 so yeah you literally can do anything, do keep in mind though that a Computer Algorithm has likely mapped this simple 12 letter text out in many ways so like chuck in an extra letter "X" and an Encoding Keyword and then take that message and apply it then to the method you wanna do. ;)

I like your video for stream cipher, but how to determine the decryption process?

you just misplaced the numerical represetations of c and d.

Fantastic thank you very much!

What happened to SA row 3?

You gave me exactly what I was looking for. Thank you so much. Hope you have an amazing day <3

Vigenere Ciphers were heavily utilized by the South during America's previous Civil War

Finally, a complete explanation delivered by a mathematician! Thanks a lot! Your work is highly appreciated.

So why will 3rd party person not be able to decrypt like Alice???

very smart of take 2 * 2 matrix and get rid of complications of higher order matrix

Thanks alot!

The Zodiac 340 cipher involves a combination of transposition cipher & substitution cipher

Thank you! (Minor detail: letter W is the 23rd letter of the alphabet, ref. 5:05).

Thank you very much, easy to understand 👌

Been looking for this video, finally found it again.

very good explaining and solving. thanks

Lmao that transposition explanation

What if trying to encrypt "red" or "redx" and you get "slk" what does the x pair up with if it is at the very bottom, and same column?

Cod 2020 baby

came here from NoahJ456 lol

who else is here because of the cold war teasers

How to find inverse if we get the determinant of the key matrix an even number. I think we cant do the same process if we get determinant an even number where we cannot find inverse using this method. Can you do the same problem using key matrix[1 7;9 3].

How is H 7 ...or are we saying A is 0 ...which is a bit confusing

In the example meet me, why u have taken e as fixed value i.e.., e=3

hi, why exactly are we using Mod ?? what help does mod does??

she sounds like the queen

Thank you so much, very helpful.

could anyone explain how to get matriks key at 3:52

Hi, what if u don't know the space is? I mean the chipertext was introduce without space.

Thanks perfect Explained

cryptoniki.blogspot.com/

cryptoniki.blogspot.com/

How do you do the mod 26 calculations?

why we must devide FF at TREFFOREST? when we separete plaintext it looks like TH EM EX ET IN GI SA TX TR EF FO RE ST

How are the matrix dimensions (4*6) chosen?

coming to the decryption part 6:42 , how did she get 12 from 15+23 mod 26? am confused any one care to explain. i will keep re watching to see if i will get it

How do you decide which letter goes first when decoding?