Diceware cracking math for @thorsheim atom Administrator Posts: 5,059 Threads: 224 Joined: Apr 2010 09-02-2013, 02:56 PM (This post was last modified: 09-03-2013, 10:13 AM by atom.) Basis dictionary from diceware is 7776 words and there are 5 words takes from it. Makes a total combination keyspace of 7776^5 = 28430288029929701376 Since the diceware RNG is hopefully a perfect one we can assume to crack a passphrase on an average at 50% of the keyspace. So we do 28430288029929701376/2 = 14215144014964850688. A single (3 year old) hd6990 card runs with 10935 MH/s against a single NTLM hash. So for a single card, we do 14215144014964850688/10935000000 = 1299967445 seconds. Then, 1299967445 / 60 = 21666124 minutes. Then, 21666124 / 60 = 361102 hours. Then, 361102 / 24 = 15045 days. Now, if we have 150 cards: 15045 / 150 = 100 days Some funny theory to continue: If we'd sacrifice some speed, let's say from 10935 MH/s down to 5042 MH/s per card, we'd able to crack 500,000 of those hashes at once! But in this case we have to scan the entire keyspace, which is 28430288029929701376. Makes a runtime of 400 days in total. But, since we're cracking 500,000 in parallel, we can do: 500,000 / 400 = 1,250 cracked passphrases per day « Next Oldest | Next Newest »

 Messages In This Thread Diceware cracking math for @thorsheim - by atom - 09-02-2013, 02:56 PM RE: Diceware cracking math for @thorsheim - by magnum - 09-02-2013, 06:02 PM RE: Diceware cracking math for @thorsheim - by atom - 09-03-2013, 10:03 AM RE: Diceware cracking math for @thorsheim - by epixoip - 09-02-2013, 06:12 PM RE: Diceware cracking math for @thorsheim - by magnum - 09-02-2013, 06:34 PM RE: Diceware cracking math for @thorsheim - by epixoip - 09-02-2013, 07:09 PM RE: Diceware cracking math for @thorsheim - by undeath - 09-02-2013, 09:45 PM