User talk:Matt Crypto

Hello,

i am writing about an image you created for the article about the Cast-128 crypto algorithm. As i studied the specific algorithm, i realized that there is a slight difference between the image and the Request For Comments 2144 where the algorithm is presented. Copying form the RFC:

      Type 1:  I = ((Kmi + D) <<< Kri)
               f = ((S1[Ia] ^ S2[Ib]) - S3[Ic]) + S4[Id]

      Type 2:  I = ((Kmi ^ D) <<< Kri)
               f = ((S1[Ia] - S2[Ib]) + S3[Ic]) ^ S4[Id]

      Type 3:  I = ((Kmi - D) <<< Kri)
               f = ((S1[Ia] + S2[Ib]) ^ S3[Ic]) - S4[Id]

The RFC also states:

  "CAST-128 uses a pair of subkeys per round:  a 32-bit quantity Km is
  used as a "masking" key and a 5-bit quantity Kr is used as a
  "rotation" key."

So i believe that the two sub-keys (Kmi and Kri) should be switched in place in the image. I believe that now the image depicts the opposite argument.

ICHTHUS

January 2012

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Hey Crypto Matt,

Wanted to say Hi :)

A file that you uploaded or altered, File:Laika (Soviet dog).jpg, has been listed at Wikipedia:Files for discussion. Please see the discussion to see why it has been listed (you may have to search for the title of the image to find its entry). Feel free to add your opinion on the matter below the nomination. Thank you. Nutella lover • [ chat│supervise ] 19:28, 20 April 2026 (UTC)[reply]