Ron Johnson escribió: > On 02/23/2009 06:12 PM, Chris Jones wrote: >> On Mon, Feb 23, 2009 at 02:34:26PM EST, Ron Johnson wrote: >> >>> Given enough time, and resources, *nothing* is untouchable. It's just >>> a matter of whether They think that the time-effort is worth being >>> spent on *you*. >> >> Like, twenty times the estimated life of the universe.. a thousand times >> its mass in silicon chips. Everyone involved long dead anyways. > > http://en.wikipedia.org/wiki/EFF_DES_cracker > When DES was approved as a federal standard in 1976, a machine > fast enough to test that many keys in a reasonable time would > have cost an unreasonable amount of money to build. > > > http://en.wikipedia.org/wiki/EFF_DES_cracker#Technology > Advanced Wireless Technologies built 1856 custom ASIC DES chips > (called Deep Crack or AWT-4500), housed on 29 circuit boards of > 64 chips each. The boards are then fitted in six cabinets. The > search is coordinated by a single PC which assigns ranges of keys > to the chips. The entire machine was capable of testing over 90 > billion keys per second. It would take about 9 days to test every > possible key at that rate. On average, the correct key would be > found in half that time. > > In the 11 years since Deep Crack, IC process technology has improved by > leaps and bounds, and the NSA can throw a whole lot of h/w in parallel > at brute-force attacks. > > Combine that with Side Channel Attacks (easy if you have the machine > that did the encryption, and which can discover part of the key) and > mathematical analysis to determine even more of the key, you suddenly > see something feasible. > > Of course, all this effort would not be spent on a dissident with some > "naughty books". > >> +1 on RHD and messier (and subtler} techniques... way to go. >
As I also have read in the Wikipedia, it is reseonable to crack a 56bits DES, a 64bits AES if you have online access to the machine, and probably in the future it might be possible to crack a 128bits, even offline. But, a 256 one? It seems incredible to me. 2^256 is this number: 115792089237316195423570985008687907853269984665640564039457584007913129639936 which is 10^79 iterations, I can't imagine the amount of power needed for cracking that... Isn't 4x10^80 the amount of atoms in the universe? -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org
