[rc5] Question for beginner

Joe Eversole jeversol at mcsc.k12.in.us
Thu Oct 23 19:53:55 EDT 1997

At 01:41 AM 10/24/97 +0300, you wrote:

>Ok, here is my question. What is changing from moving from the 56 bit
>key to the 64?
>I know the keyspace expands a lot -how much, really?

The "bit" is how many powers of 2 the number of keys goes up. 57 bit key
has twice as many possibilities as a 56 bit key. We are now checking 2^64
possible keys for matches ... which is a whole hell of a lot :) My
calculator says 
64 bit: 18,446,744,073,700,000,000 (rounded, of course). 
56 bit: 00,072,057,594,037,927,936 (leading 0's on purpose)

eighteen quintillion, four hundred fourty six quadrillion, seven hundred
fourty fourt trillion, seventy three billion, seven hundred million keys
(wow, I need a life <G>)

>But then the algorithm remains the same isn't it? Why we need new

That, I don't know =)
Joe Eversole (jeversol at mcsc.k12.in.us) (Gamma at IRC)
Mooresville Consolidated School Corporation
(317) 831-9203 Ext. 125 -- Fax: (317) 831-9206
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