[hashcash] Re: copacobana
- From: "Eric S. Johansson" <esj@xxxxxxxxxx>
- To: hashcash@xxxxxxxxxxxxx
- Date: Thu, 18 Oct 2007 11:14:12 -0400
Bas Steendijk wrote:
http://www.copacobana.org/
this is a low cost ($10000) device which uses 120 FPGA's to do parallel
computation work which uses little communication, such as brute force
searches. it can crack DES in 7 days average at 2^35 attempts per
second. it can likely be programmed to assist in hashcash stamp
generation, which would be interesting for spammers.
this is basically the same problem that we face today with zombies. It's a
question of does the opportunity cost as defined by the revenue per message and
the message rate support the cost of running this box and re-architecting your
zombie network to ask for stamps from a central server. Another way of looking
at the problem is asking which is more efficient and cost-effective, a dedicated
computation engine or a distributed stamp generation engine (i.e. a bunch of
zombies)
--
Speech-recognition in use. It makes mistakes, I correct some.
- References:
- [hashcash] copacobana
- From: Bas Steendijk
Other related posts:
- » [hashcash] copacobana
- » [hashcash] Re: copacobana
http://www.copacobana.org/this is a low cost ($10000) device which uses 120 FPGA's to do parallel computation work which uses little communication, such as brute force searches. it can crack DES in 7 days average at 2^35 attempts per second. it can likely be programmed to assist in hashcash stamp generation, which would be interesting for spammers.
- [hashcash] copacobana
- From: Bas Steendijk