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Subject: Re: Do top programs use 64 bit hash signature?

Author: Robert Hyatt

Date: 06:24:52 12/14/99

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On December 13, 1999 at 15:11:10, Dann Corbit wrote:

>On December 10, 1999 at 22:08:44, Robert Hyatt wrote:
>[snip]
>>Not exactly.  Suppose you have exactly 4 billion (2^32) entries.  You can use
>>the right-most 32 bits to form the hash probe address, and store the leftmost
>>32 bits for verification.  You are using _all_ 64 bits.  But since the right
>>most bits are used for the address, there is no use in storing them at that
>>address, right?
>
>What a beautiful, general purpose technique!
>
>This could be used for any sort of hash!!!
>
>I will definitely toss this beauty into my bag of tricks.
>
>It rates a double-wow!


The only bad news is that this has been done forever.  :)



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