[Hardware] Notes on packing serial cores into Xilinx devices

Dan Oetting dan_oetting at uswest.net
Sun Aug 15 15:45:26 EDT 2004


On Aug 15, 2004, at 12:46 PM, jbass at dmsd.com wrote:

> Elektron <elektron_rc5 at yahoo.ca> writes:
>> Now, you win $10000. Assume electricity costs an insanely low 1 cent
>> per kWh. Assume equipment is free. So you have 1 million kWh (== 
>> 3.6e12
>> J) to spend cracking 2^71 keys (since, on average, you search half the
>> keyspace to find the result). That's 1.5e-9 Joules per key.
>
> This argument only makes sense if some central admin is making a 
> reasoned
> choice to participate in the project. From an individul perspective, at
> $4/mo to leave a PC running with lottery like odds to potentially win
> $10,000 ... the breakeven point for a winner is 10000/4= 2,500 months.

$4 per month = 4 chances to win lottery, odds of winning: 4 in 5 
million, minimum jackpot $1.5 million (Colorado Lottery, your state may 
vary).

$4 per month running PC cranking 15 million keys per second (about 40 
trillion(US) keys per month) odds of winning: 1 in 100 million, maximum 
payoff $10,000.

"like" a difference of over  4 orders of magnitude. RC5-64 wasn't even 
in the ball park.


"Casino taxes and lottery proceeds should be used to support education. 
Especially math skills." -- Dan Oetting



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