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Cobra?


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       Fm(Ui), Fc(Yi), F(Ui), Fm(Yi) -    
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       Cl -       ;
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       384        257 .
    -------------------------------------------------------------------

     1- . (   
    =======================                )
   1.    i=1    
       U, Y  1     f1  .
   2.   i-   :

             C'i = (Ti - K1) XOR Fm(Ui-1 mod 256)

   3.     U  Y:

             Ui  = (Ui-1 mod 256) XOR Fc(Yi-1 mod 256)
             i  = (i-1 mod 256)+ Cl'i

   4.   i-   :

             Ci =  C'i + Ui

   5.  i=i+1.  i<=256,    .2,  .
   ------------------------------------------------------------------

     2- . (   
    =======================                 )
   1.    i=1    
       U, Y    f2  .
   2.   i-   :

             C'i = Ti XOR F(Ui-1 mod 256)

   3.     U  Y:

             Ui  = (Ui-1 mod 256) XOR Fm(Yi-1 mod 256)
             i  = (i-1 mod 256)+ Ch'i

   4.   i-   :

             Ci =  C'i + Ui

   5.  i=i+1.  i<=256,    .2,  .
   ----------------------------------------------------------------

     3- . (   
    =======================               )

   1.    i=1    
       U, Y      f3  .
   2.   i-   :

          C'i = (Ti + C'i-1)  XOR  Fm(Ui-1 mod 256)

   3.     U  Y:

          Yi = Yi-1 + Cl'i-1
          Ui = ((Ui-1 mod 256) XOR Fc(Yi mod 256)) + Ch'i-1

   4.   i-   :

          Ci =  C'i + Ui

   5.  i=i+1.  i<=256,    .2,  .
   ----------------------------------------------------------------

     4- . (   
    =======================                 )

   1.    i=1    
       U, Y      f4  .
   2.   i-   :

          C'i = (Ti + C'i-1)  XOR  F(Ui-1 mod 256)

   3.     U  Y:

          Yi = Yi-1 + Ch'i-1
          Ui = ((Ui-1 mod 256) XOR Fm(Yi mod 256)) + Cl'i-1

   4.   i-   :

          Ci =  C'i + Ui

   5.  i=i+1.  i<=256,    .2,  .
   ----------------------------------------------------------------

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