[rc5] RC64 keyspace

Marc Sissom msissom at dnaent.com
Tue Oct 28 12:36:14 EST 1997

Eric Gindrup wrote:

BTW, your indentation is a pain.

> Assuming that one bit is used to record the assignment of a
> block and one bit is used to record the receipt of a block, 2^65 bits
> will be needed.  This is 2^32GB (4 Exabytes).  I don't know where *I*
> would go to look for a storage system of that magnitude...

We had 2^56 _keys_ in RC5-56. We have 2^64 keys in RC5-64.
If a block is still 2^28 keys long, we have 2^36 blocks.
One bit for assigned, one for returned = 2*2^36 bits, not 2*2^64.
That's 2^29 raw bytes and a much more manageable figure.

Or am I jumping into the middle of a conversation about RC-92?

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