NODE 53b2d7a2DES search
Why doesn't someone speed up the DES search with Hellman's time-space tradeoff, whose precomputation could be done within a month? Alan T. Sherman sherman@cs.umbc.edu
DES search
4 expanded posts ยท every known parent and child
NODE 76298435Re: DES search
On Thu, 26 Feb 1998, Dr. Alan Sherman wrote: > Why doesn't someone speed up the DES search with Hellman's > time-space tradeoff, whose precomputation could be done within > a month? Probably because finding spare CPU cycles on thousands of machines is easy and free, while finding the disk storage space that you mention would be expensive, and I doubt distributed.net has the resources. And people who do have the resources are busy doing other things with them, or keep them at Fort Meade. I forget because I haven't read that part of Applied Crypto in a while, but wasn't it terabytes of storage? -- Andrew Fabbro [afabbro@umich.edu] [andrewf@jesuswept.com] http://www-personal.umich.edu/~afabbro/ 313.647.2713 "When in Bologna will a Fabbro rise again?" --Dante
NODE 0c0579b5Re: DES search
A few terabytes of storage isn't THAT expensive. Let's see: 1,000,000,000,000 bytes a CDROM holds about 640 MB, which means that 1563 CDs could hold it. At CompUSA, that were recently selling recordable CD's for $10 for five, but with a mail-in $10 rebate which means you're only paying 32 cents for postage for 5 CD's. .32*1563=$500 or so. Add in the cost of a few CD-R drives @ $300 each = $900 for recording. Combined total=$1400 Within the reach of distributed.net, I would think. On Thu, 26 Feb 1998 16:01:55 -0500 (EST) andrew fabbro <afabbro@umich.edu> writes: >On Thu, 26 Feb 1998, Dr. Alan Sherman wrote: > >> Why doesn't someone speed up the DES search with Hellman's >> time-space tradeoff, whose precomputation could be done within >> a month? > >Probably because finding spare CPU cycles on thousands of machines is >easy and free, while finding the disk storage space that you mention >would be expensive, and I doubt distributed.net has the resources. >And people who do have the resources are busy doing other things with >them, or keep them at Fort Meade. > >I forget because I haven't read that part of Applied Crypto in a >while, >but wasn't it terabytes of storage? > _____________________________________________________________________ You don't need to buy Internet access to use free Internet e-mail. Get completely free e-mail from Juno at http://www.juno.com Or call Juno at (800) 654-JUNO [654-5866]
NODE cad61cdeRe: DES search
On Thu, 26 Feb 1998 vcarlos35@juno.com wrote: > a CDROM holds about 640 MB, which means that 1563 CDs could hold it. > At CompUSA, that were recently selling recordable CD's for $10 for five, > but > with a mail-in $10 rebate which means you're only paying 32 cents for > postage > for 5 CD's. .32*1563=$500 or so. > Add in the cost of a few CD-R drives @ $300 each = $900 for recording. > Combined total=$1400 Yes, but then you have to be able to read them all too. :) I'm not up on CD changers, but how much would sufficient changers cost to read from those 1500+ CDs? (Remember, we only need to read 1560 of 'em since the CDRs can double as readers... :) Maybe when DVD-ROM gets out there, and somewhat affordable, but not with CDs (IMHO OC). dave ----- David E. Smith, P O Box 324, Cape Girardeau MO 63702 http://bureau42.base.org/people/dave/ dave@bureau42.ml.org "Quite simply, I'm telling you to GROW UP." -- Dunkelzahn's will