[RC5] 40 bit encryption

Jeroen v.d.burg at planet.nl
Sat Mar 16 10:20:05 EST 2002


if the number is signed there are also 2^40 numbers
2^39 of them are positive (if 0 is positive)
and 2^39 negative

*********** REPLY SEPARATOR  ***********

On 3/15/2002 at 7:57 PM Satya wrote:

>On Mar 15, 2002 at 18:59, Don Cohen wrote:
>
>>Oops I forgot the rightmost bit is 2^0 not 2^1 so 40 bit encription does
>have 
>>2^40 -1 possible keys.
>
>A 40 bit number has maximum 40 bits. Assuming it's an unsigned
>integer, there are 2^40 numbers. If you don't wnat to include 0, that
>gives (2^40)-1 numbers.
>
>-- 
>Satya. <URL:http://satya.virtualave.net/>
>Any sufficiently advanced technology is indistinguishable from a perl
>script.
>
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