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Title: . Post by: Vladimir on March 22, 2011, 05:22:39 PM .
Title: Re: in UK cost of 50 percent attack on bitcoin is 60 million pounds Post by: dbitcoin on March 22, 2011, 05:33:58 PM http://www.itpro.co.uk/632131/fujitsu-returns-to-uk-supercomputing You compare fixed point with floating point. Apparently UK government paid 15 million pounds for 190 TFLOPS supercomputer. Since one needs more than one PFLOPS to match bitcoin network attack on bitcoin for them would cost a little as 60 million pounds! Fools! I could have sold them 190 TFLOPS supercomputer for less than 100k£ a year. lol. Moreover, it would fit, can be powered and cooled in my garage. FLOPS - floating point operations, usually with double precision +/- e^308. Title: Re: in UK cost of 50 percent attack on bitcoin is 60 million pounds Post by: dbitcoin on March 22, 2011, 05:47:34 PM you are wrong here, I do not compare FLOPS and INTOPS. And how you build 190TFLOPS with 100k budget? :)Title: Re: in UK cost of 50 percent attack on bitcoin is 60 million pounds Post by: dbitcoin on March 22, 2011, 06:06:31 PM you are wrong here, I do not compare FLOPS and INTOPS. But I do derive my conclusions from the fact that a 5 TFLOPS 5970 does about 0.6 Ghps. You need good connection between nodes, infiniband or similar, not cheap infrastructure for such beast. And definitely supercomputer need more ram and disks than usual cluster. Cooling, power and etc.. Title: Re: in UK cost of 50 percent attack on bitcoin is 60 million pounds Post by: dbitcoin on March 22, 2011, 06:12:12 PM Moreover this is not just a theory, I am actually operating a supercomputer with more than 200 TFLOPS of computational power, right now. It's a sum of several nodes? 16G/s + 16Gh/s + ....Cluster != supercomputer for some tasks (i.e. if need more memory for one task). Title: Re: in UK cost of 50 percent attack on bitcoin is 60 million pounds Post by: Anonymous on March 23, 2011, 08:32:48 AM Maybe they are the mystery miner? :D
Title: Re: in UK cost of 50 percent attack on bitcoin is 60 million pounds Post by: gigabytecoin on March 23, 2011, 09:41:53 AM ok, with infiniband and lots of memory it would be 15-20% more expensive. Cooling and power and DC is included in my price. Dual 1 Gbps supplied by default is not that bad. "Lots of disks" is not included, I admit that. But this is not such an important thing for most computational tasks. Sooo.... this is a sales thread!???!! Title: Re: in UK cost of 50 percent attack on bitcoin is 60 million pounds Post by: Raulo on March 23, 2011, 12:58:57 PM And for a botnet, it is a mere $2500 a month.
Apparently, a 30 mln box botnet brought the "owners" $139k a month of revenue, i.e, $5 per 1000 boxes. http://en.wikipedia.org/wiki/BredoLab You need 500 GH/s for 50% attack or 500k boxes = $2500 (you can get more than 1MH/s per box but if you don't want to be detected, you are going to utilize a fraction of CPU). For a mere $2500 a month, you can either severely impair Bitcoin (start double spending, etc.), or mine 2016 blocks per month if you play by the rules or 4032 if you do mining cartel. Title: Re: in UK cost of 50 percent attack on bitcoin is 60 million pounds Post by: dbitcoin on March 23, 2011, 03:49:11 PM And for a botnet, it is a mere $2500 a month. Apparently, a 30 mln box botnet brought the "owners" $139k a month of revenue, i.e, $5 per 1000 boxes. http://en.wikipedia.org/wiki/BredoLab You need 500 GH/s for 50% attack or 500k boxes = $2500 (you can get more than 1MH/s per box but if you don't want to be detected, you are going to utilize a fraction of CPU). For a mere $2500 a month, you can either severely impair Bitcoin (start double spending, etc.), or mine 2016 blocks per month if you play by the rules or 4032 if you do mining cartel. Looks like now we know where is shady miner :) Title: Re: in UK cost of 50 percent attack on bitcoin is 60 million pounds Post by: dbitcoin on March 23, 2011, 05:12:16 PM And for a botnet, it is a mere $2500 a month. Apparently, a 30 mln box botnet brought the "owners" $139k a month of revenue, i.e, $5 per 1000 boxes. http://en.wikipedia.org/wiki/BredoLab You need 500 GH/s for 50% attack or 500k boxes = $2500 (you can get more than 1MH/s per box but if you don't want to be detected, you are going to utilize a fraction of CPU). For a mere $2500 a month, you can either severely impair Bitcoin (start double spending, etc.), or mine 2016 blocks per month if you play by the rules or 4032 if you do mining cartel. So, what would it take to nullify this threat scenario? If a 500 Ghash/s attack can come from 500,000 zombies, then the full force of a 30,000,000 strong botnet would be 60*500 Ghash/s would be 30,000 Ghash/s. Let's say that is doubled to 60,000 Ghash/s to safely nullify the threat. It seems to me that it cold be a long time before Bitcoin has that kind of capacity. But maybe there is something we are missing here... And another problem - you always need fresh getwork from one place (one wallet) if you want solve blocks. But for per share cheaters, this probably nice and steady solution :) Title: Re: in UK cost of 50 percent attack on bitcoin is 60 million pounds Post by: allinvain on April 16, 2011, 03:32:42 PM I am thinking trusting the nodes that have the highest network uptime would be a good solution to this :p. A user could set the bitcoin software to take preference to these nodes.
Title: Re: in UK cost of 50 percent attack on bitcoin is 60 million pounds Post by: Anonymous on April 19, 2011, 06:53:07 AM The obvious answer-if enough bitcoiners got together would be to purchase a botnet.
;D Title: Re: in UK cost of 50 percent attack on bitcoin is 60 million pounds Post by: gigabytecoin on April 19, 2011, 07:07:33 AM http://www.itpro.co.uk/632131/fujitsu-returns-to-uk-supercomputing Apparently UK government paid 15 million pounds for 190 TFLOPS supercomputer. Since one needs more than one PFLOPS to match bitcoin network attack on bitcoin for them would cost Fools! I could have sold them 190 TFLOPS supercomputer for less than 100k£ a year. lol. Moreover, it would fit, can be powered and cooled in my garage. edit: as little as -> not less than Governments almost ALWAYS overpay. Here is an example: http://www.whatdotheyknow.com/request/ico_website_favicon_cost (http://www.whatdotheyknow.com/request/ico_website_favicon_cost) I could whip you up a favicon of your company or government logo in under 60 seconds. The UK Gov't paid ~600 pounds for this service. Or about 50-100X typical cost. Title: Re: in UK cost of 50 percent attack on bitcoin is 60 million pounds Post by: ataranlen on April 19, 2011, 05:05:31 PM http://www.itpro.co.uk/632131/fujitsu-returns-to-uk-supercomputing Apparently UK government paid 15 million pounds for 190 TFLOPS supercomputer. Since one needs more than one PFLOPS to match bitcoin network attack on bitcoin for them would cost Fools! I could have sold them 190 TFLOPS supercomputer for less than 100k£ a year. lol. Moreover, it would fit, can be powered and cooled in my garage. edit: as little as -> not less than Governments almost ALWAYS overpay. Here is an example: http://www.whatdotheyknow.com/request/ico_website_favicon_cost (http://www.whatdotheyknow.com/request/ico_website_favicon_cost) I could whip you up a favicon of your company or government logo in under 60 seconds. The UK Gov't paid ~600 pounds for this service. Or about 50-100X typical cost. "Whilst we hold no recorded information concerning this part of your request I can advised you that the work needed to put the favicon live was complicated by an old environment (which has since been updated) that caused issues and extended the time taken to carry out the work." Governments do always overpay... I'm not sure the current rate for web programming, but that looks like serious overpayment. Title: Re: in UK cost of 50 percent attack on bitcoin is 60 million pounds Post by: jpp on April 21, 2011, 02:25:08 PM Total is a UK energy company) Total is a French company! (and the biggest french company) |