Vigenere Cipher Explained (with Example)

In this video I walk through the basics of the Vigenère cipher!
Link to Python implementation: • Cryptography: Vigenere...
Link to read more about how to break the vigenere: crypto.interactive-maths.com/...

[@AladdinPersson]

*Update to the video:*
Several has mentioned an error in the video which is that the dictionary used mapping characters to values is incorrect as A should be mapped to the value 0 and not the value 1, and this is the same for the rest, i.e that they should all be subtracted by 1

[@donaldtomas7535]

@Theodore Braxton Definitely, I have been using instaflixxer for since december myself =)

[@hats5864]

Hey man, just want to say thanks for the great explanation. Just got into cryptography and Im loving it. You explained it really well!

[@AladdinPersson]

Thanks man, I appreciate the kind words

[@sonaronline4230]

You explained this amazingly mate - cheers for that.

[@alfarrouq9756]

Great explanation thank you!

[@curiousmatt4052]

Great video! Thank u so much)

[@hosseinvampire8923]

very good explanation thx buddy

[@iasontzortzis9472]

Great video helped a lot in understanding it :)

[@user-sb9vs5gc4m]

Can you tell me why -11 become 15? Thanks

[@jojojihn8761]

Thanks man. Writing an exam about this tomorrow. Helped a Lot

[@jasmineroberts9208]

Am I wrong or is E suppose to be 5, not 6?

[@AladdinPersson]

You're absolutely right, there's a mistake in the video E is supposed to be 5 not 6!

[@__Jun__]

What should I do when you subtract the encryption that ends up with 0?
My grammar sucks, sorry :/

[@HasanAli-jw7ty]

0 is A, the table used is wrong. It should start with 0 for A, 1 for B, and so on.

[@kateandkonnyinfunfamily3402]

nice video bro.....what is your nationality????

[@smoochytehruiner]

Shouldn't A start at 0 rather than 1?

[@AladdinPersson]

It should yes

[@venkatsaiputtagumpalla4367]

what if sum is 26

[@urmom_osu1455]

keep as 26

[@Crimin4L]

I am seeing that the alphabet should start at 0 not 1.

[@DavidDomfeh]

i think you got the spelling of love wrong it was spelt loove

[@neelsalunke6422]

Bro this is vernam cipher
NOt vigenere
And a starts at 0.

[@AladdinPersson]

You're right that it should start at 0, but I do think this is in fact the vigenere cipher.
If you read:
en.wikipedia.org/wiki/Vigen%C3%A8re_cipher
www.geeksforgeeks.org/vigenere-cipher/
This is the method I described in the video, from my understanding the vernam cipher uses an XOR operation similar to One-Time-Pad which this does not.

[@user-sb9vs5gc4m]

How did -11 become 15, i need explanation sir

[@nyusyadacunha5973]

Usually when the number is less than the mod, it's other alternative remainder (or additive inverse mod 26) is negative. Here 15 is congruent to 15 mod 26 since it's less than 26. But the inverse that is -11 is also congruent because 15+11=26, so if you take 11 on the other side it will be negative, as in 15 is congruent to -11 mod 26

[@user-sb9vs5gc4m]

@@nyusyadacunha5973
Can't say how much I'm grateful, thanks that was helpful !

[@madsyhmi]

udinn