Re: DES Key Decryption Time

From: Glynn Clements (glynn.clementsat_private)
Date: Wed Apr 09 2003 - 21:06:51 PDT

  • Next message: Valdis.Kletnieksat_private: "Re: DES Key Decryption Time"

    Valdis.Kletnieksat_private wrote:
    
    > > In hardware you can unroll the loop and use pipelining giving even
    > > 1 cycle per 1 block of data (not to mark about paralel processing
    > > which is easy with today's FPGAs).
    > 
    > Well.. one externally visible cycle - if you unroll the loop you
    > need to either have 16 cascading stages that use async logic or
    > timing signals to keep all the bits in sync. ;)
    
    Theoretically you could just expand the operation to minterms
    (sum-of-products), although it might result in a rather large chip. If
    you have enough gates, any computation on fixed-sized inputs can be
    performed solely by combinatorial logic (i.e. "in one cycle").
    
    -- 
    Glynn Clements <glynn.clementsat_private>
    



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