Autokey Encryption is not there in this. #32

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1. Chunjee commented on Dec 27, 2022

   

   Chunjee

   on Dec 27, 2022

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   https://en.wikipedia.org/wiki/Autokey_cipher

   An autokey cipher (also known as the autoclave cipher) is a cipher that incorporates the message (the plaintext) into the key. The key is generated from the message in some automated fashion, sometimes by selecting certain letters from the text or, more commonly, by adding a short primer key to the front of the message.

   There are two forms of autokey cipher: key-autokey and text-autokey ciphers. A key-autokey cipher uses previous members of the keystream to determine the next element in the keystream. A text-autokey uses the previous message text to determine the next element in the keystream.

   👍React with 👍1Reacted by GameEntity903

   😄React with 😄1Reacted by GameEntity903
2. GameEntity903 commented on Dec 28, 2022

   

   GameEntity903

   on Dec 28, 2022

   Author

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   Encoding and Decoding functions. No idea whether this is fully optimized or not.

   AutoKeyEnc(Primer,Input) ;GameNtt
   {
   alphacount := 0
   spacecount := 0
   spacecount2 := 0
   Loop, Parse, Input
   {
   chint := Asc(A_LoopField)
   if(((chint >= 65) && (chint <= 90)) || ((chint >= 97) && (chint <= 122)))
   alphacount++
   else if(chint == 32)
   {
   spacecount++
   if(A_Index > (StrLen(Input)-StrLen(Primer)))
   spacecount2++
   }
   }
   alphacount := alphacount - StrLen(Primer)
   totalcount := alphacount + spacecount - spacecount2
   Return Vigenere((Primer . SubStr(Input, 1, totalcount)),Input)
   }

   AutoKeyDec(Primer,Input) ;GameNtt
   {
   Inlen := StrLen(Input)
   PrimerLen := StrLen(Primer)
   Primer2 := Primer
   Primer2Len := StrLen(Primer2)
   nofloops := (Inlen//PrimerLen)+1
   Loop, %nofloops%
   {
   output := VigenereDec(Primer2,(SubStr(Input,1,Primer2Len)))
   Primer2 := Primer . output
   Primer2Len := StrLen(Primer2)
   }
   Return output
   }