Affine Cipher - Decryption (Known Plaintext Attack)

[@haji-koto9765]

This is the littiest tutorial with 0 confusions that i've ever seen Saving and subbing just in case I might need this for the future Thanks a lot

[@ElijahHall-p8c]

Fantastic tutorial. Thank you for making my night of studying that much easier.

[@ellieneedsalife]

thank you, this has just saved my grade during a uni exam

[@mrdoctor182]

totally saved me on my midterm!! thank you so much

[@lilbowwowy]

thank you very much for this. I spend a day watching this video in order to conquer a similar question. The question was the final boulder and I completed. Thank you again. Gained yourself another subscriber

[@mariasteinborn8079]

thanks for such as clear and easy-to-understand video.

[@boafogordon2430]

Using the affine cipher, encrypt the string “TABLE” using the keys a = 3 and b = 2. Given the definition below: E(x) = a.x + b (mod 26) D(y) = a-1 .(x-b)(mod 26) i need help guys

[@priyamr5616]

how you got 9 mod 26 for beta. I want clear explanation.

[@audreyli9535]

because first you do 17*8 mod 26 which gives you 6 as the remainder. Seeing the equation, 15= 6+b, we can see that "9" fits the role as b since 9+6=15. Hope this helps you.

[@derlukas8182]

u usually don't need "known plaintext", since the affine cipher is linear and can be represented as a substitution cipher, which allows statistical attacks.

[@mouad2274]

+Der Lukas can you explain how we can find key without "known plaintext" pls ?

[@ddxfraxinusdne]

+mouad marmouchi kzbin.info/www/bejne/gpK6oZKBppWWgdU&feature=gp-n-y&google_comment_id=z12nxpijksndw5nov04ch1ow5zymsxaq1as

[@anantshekhar698]

You mean frequency analysis?

[@bobkeemos8943]

Hello, can you help me with how you would find out the A and B values if the Ciphertext SD mapped to the Plaintext EN? Thanks

[@978743]

This video helped me twice

[@lord_luce]

can confirm that, we spent hours to convert 1/3 to 3^-1, which is 9 😅

[@yari_dawg]

god damn this video was so helpfull for my university work, thank you

[@inspireincept-ii8745]

What is the complexity of this method, O(?), please help.

[@tingting5268]

I have codebusters competition tomorrow for science olympiad and I'm so doomed I don't know what those mods are or any of the equation things 😪

[@mnageh-bo1mm]

Oh boy Great video right here : )

[@MahmoudShoair]

can u make a video for hill Cipher - Decryption (Known Plaintext Attack)

[@mohamedmoustafa5747]

What if you dont get an invertible number? Currently dealing with this problem: 66a + b = 63 mod 68 30a + b =25 mod 68

[@wesjones3082]

did you ever figure it out?

[@AlxWWExREY]

so i got a 2 letters fr encrypted as eu in mod 28 and the number i am supposed to get the multiplicate inverse for dosnt have a multiplicate inverse what do i do wrong?

[@daniellehibbs-heiser3273]

SO what happens if you were to try and find the inverse and you end with a 0 and not with a one. So finding 6^-(1)

[@brandonstaker2066]

Where did the mod go

[@mahedihasanchowdhury3247]

I am grateful. Thank you ma'am.

[@floatingyunsan]

Anybody know why my beta value is wrong?

[@ThaLiquidEdit]

Thank you for this video!

[@rhysjennings3877]

I know this video is pretty old, but thank you very much. Helped heaps :)

[@kylemx15]

My alpha was negative?

[@kregg34]

Its fine just add 26 until it becomes positive

[@runninman61]

How does 25*9 equal 17(mod26)? I can't figure it out

[@runninman61]

Figured it out :) hahaha

[@sebastianstjohnston]

how????

[@AviLevi123]

@@sebastianstjohnston 25 * 9 = 225 => 225 mod 26 => 17 so 17 mod 26 = 225 mod 26

[@sebastianstjohnston]

@@AviLevi123 Thanks.

[@pablovaleriamorales8229]

I love you, thank for this video

[@davidribeiro300]

i love you thank you for MD

[@davidribeiro300]

​@ROROROSEEEEE HAPPY BDAY!!!! -1 mod 26 is the same as 25 mod 26

[@davidribeiro300]

​@ROROROSEEEEE HAPPY BDAY!!!! You do -1 plus 26 because you dont want negative Number

[@Tofos94]

youre the best thanks :)

[@mariusl.1469]

Very helpful, thanks!

[@nicharooni]

this is the BEST

[@sp3ct3r71]

hey you sounded like pam beesly from the office:D

[@3682wayne]

life saver thanks

[@emrecanya]

thx, it was helpful to understand :)

[@amitkumardas1860]

Thank you.

[@divyas6932]

thank you it's was useful

[@farisalhonainy1866]

Thanks alot

[@muaazhammad4446]

how can someone get first two letters of plane text???? its illogical .. you should do this with frequency analysis

[@PeterWalkerCJ]

Ha Ha! But Question Paper has Theoretically.