Re: Breaking DES

["Perry E. Metzger" <pmetzger@lehman.com>]

J. Eric Townsend says:
> "Perry E. Metzger" writes:
>  > Tell you what, Karl -- when you build the device that can store 2^56
> 
> I have 1/72nd of that storage capacity in the next room, using
> off-the-shelf technology.  Also, 8GB RAM, and another 300-500GB of
> 'fast' storage local to the CPU.

My bogometer just triggered, so I decided to check your math.

(2^56)*8 = 576,460,752,303,423,488 
((2^56)*8)/72 = 8,006,399,337,547,548 or eight quadrillion bytes.

> (Cray C90, 1GW main memory, .5TB drive storage of various types, 9
> tape silos)

Gee, half a terrabyte. Thats 16,000 times less than you claimed.

> Again, all off-the-shelf technology.  Tape robots are a few years old,
> actually. :-)

Your off the shelf slow speed tape technology isn't even 1/16,000 of
what you claimed, and its over a million times less storage than you
would need, in *RAM*, for the proposed task.

Perry