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- 09-18-2003, 04:17 PM #1Josue MartinezGuest
excuse my lack of understanding, what is hashing{in ref. to ESN and
MIN}; please educate me.
[email protected] (Andrew Shepherd) wrote in article
<[email protected]>:
> Msea <[email protected]> wrote in message news:<BJcab.376666$Oz4.157244@rwcrnsc54>...
> > Andrew Shepherd wrote:
> > > For the vast majority of the group, this may be of very limited
> > > utility, interest, or understanding. But I know that there are at
> > > least a few regulars out there who might appreciate this. After much
> > > toil & trouble, including more Boolean IF operands than I care to
> > > mention, I have authored an Excel spreadsheet algorithm that
> > > synthesizes the CDMA mobile channel selection hash function according
> > > to MIN & number of deployed channels in the network CDMA channel list.
> >
> > How about according to ESN?
>
> Altering the algorithm to perform hashing via ESN would actually be a
> simple modification, even reducing the total number of operations, as
> the 32-bit binary ESN directly translates to the HASH_KEY parameter.
> No extraction of the MIN from the IMSI nor digit rotation nor binary
> conversion nor serial juxtaposition nor MSB truncation is required.
> According to my understanding of the ESN hashing process, the 32-bit
> ESN simply becomes the 32-bit HASH_KEY, which would allow one to omit
> steps one & two in my MIN-based algorithm.
>
> Unfortunately, at least for my handset, the ESN is expressed as either
> or both a decimal or hexadecimal number. While I already include a
> decimal to 10-bit binary process in the current MIN version, and while
> I could relatively easily create a hexadecimal to decimal or binary
> conversion utility, sadly Excel balks at working w/ such large numbers
> as the ESN, 2^31, et al., that would be required for a decimal to
> 32-bit process. However, if one were to already have the ESN in
> binary, or if one were to manually convert the ESN to binary, one
> could simply input that 32-bit number into step 3 in the algorithm,
> such that the output of the algorithm would reflect ESN hashing
> instead of MIN hashing.
>
> FYI, I have temporarily removed the hash function emulator from my
> site. I discovered an issue w/ my IMSI digit rotation logic, such
> that MINs containing leading zeros could prove problematic, producing
> negative numbers for the IMSI_S parameter. Most MINs were unaffected,
> and I will repost the algorithm once I have universally corrected the
> digit rotation logic.
>
> Andrew
> --
> Andrew Shepherd
> [email protected]
> [email protected]
> http://www.ku.edu/home/cinema/
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