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Re: Re: Re: Encrypting Largish Files

by filmo (Scribe)
on Sep 26, 2001 at 21:06 UTC ( #114868=note: print w/replies, xml ) Need Help??


in reply to Re: Re: Encrypting Largish Files
in thread Encrypting Largish Files

Just for clarification, could you explain your math. How do you get from 256 states to to 1683 bits as 256 * 8 = 2048?

Also, when you say "only 96^8 or 2^52" how are these two equivalent as 96^8 = 7.21e15 and 2^52 = 4.5e15 or did you mean something different?

I'm only asking because I'm just starting to learn about cryptography..

As a side note, how long does it currently take to brute force your way through 4.5e15 keys using non-military strength computers. (assumes that hackers have only consumer to academic calibur machines.)?
--
Filmo the Klown

Replies are listed 'Best First'.
Re: Re: Re: Re: Encrypting Largish Files
by John M. Dlugosz (Monsignor) on Sep 27, 2001 at 01:01 UTC
    256! (factorial), not 256*8. Start with the list 0..255 and shuffle it. That list is 2048 bits long, but you will never have, for example, two bytes both containing 42. So the number of legal states is smaller than the number of states that this much memory can represent.

    7.21e15 vs 4.5e15 : within a factor of 2 (1 bit). Fractional bits don't count, so round down. 2^52 is a little small, but 2^53 is too large.

    —John

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