[rc5] RC64 keyspace
STROTTIER at novell.com
Tue Oct 28 18:09:44 EST 1997
There goes their $1000. So much for resupplying the caffeinated beverages!
>>> Joseph Fisk <joe at rm405n-a.roberts.fit.edu> 10/28 7:24 PM >>>
Each block is 2^28 keys. There are total 2^64 keys. That means there are
2^36 blocks, or 68,719,476,740 blocks. If two bits are used per block,
you'll need 137438953500 bits, which is 17,179MB. I think you
accidentally calculated the size of the array needed to keep track of each
> In any event, I'd expect that the Bovine crew is going to need
> about 256-times as much storage for this information as was used in
That sounds right to me, too. In 56-bit RC5 there were 2^28 blocks. With
two bits per block you would need 536,870,912 bits, or 67.1MB.
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