Tech ARP Forums

Go Back   Tech ARP Forums > Software Discussion > General Software
Register
FAQ Members List Calendar Arcade Mark Forums Read

Google Web www.techarp.com forums.techarp.com

General Software This is the forum for general discussions about software.

Reply
 
LinkBack Thread Tools
Old 9th Jan 2007, 05:51 PM   #1 (permalink)
h@x!
 
Max_87's Avatar
 
Join Date: 11 Aug 2003
Location: Sarawak, Malaysia.
Posts: 11,261
Reputation: 2024
Max_87 has a reputation beyond reputeMax_87 has a reputation beyond reputeMax_87 has a reputation beyond reputeMax_87 has a reputation beyond reputeMax_87 has a reputation beyond reputeMax_87 has a reputation beyond reputeMax_87 has a reputation beyond reputeMax_87 has a reputation beyond reputeMax_87 has a reputation beyond reputeMax_87 has a reputation beyond reputeMax_87 has a reputation beyond repute
Rep Power: 37
Default For those who lost their windows password...

http://ophcrack.sourceforge.net/

__________________
Max_87
Tech ARP
http://www.techarp.com

P4 630 / Abit IP35 Pro / G.Skill F2-8000CL5-4GBPQ / Radeon X1800 / Barracuda 7200.9 120GB / 7200.10 320GB x2 / Caviar SE16 WD5000AAKS / WD6400AAKS x2 / Dell 2007FP x2 / Silverstone ST56F
Max_87 is offline   Reply With Quote
SPONSOR

Old 9th Jan 2007, 07:54 PM   #2 (permalink)
Administrator
 
Chai's Avatar
 
Join Date: 6 Oct 2002
Location: Maranello
Posts: 26,668
Reputation: 3984
Chai has a reputation beyond reputeChai has a reputation beyond reputeChai has a reputation beyond reputeChai has a reputation beyond reputeChai has a reputation beyond reputeChai has a reputation beyond reputeChai has a reputation beyond reputeChai has a reputation beyond reputeChai has a reputation beyond reputeChai has a reputation beyond reputeChai has a reputation beyond repute
Rep Power: 72
Default

Hmm...isn't this a bad thing?
__________________
Chai (Contributor & Forum Admin)
http://www.techarp.com/
Chai is online now   Reply With Quote
Old 9th Jan 2007, 09:42 PM   #3 (permalink)
h@x!
 
Max_87's Avatar
 
Join Date: 11 Aug 2003
Location: Sarawak, Malaysia.
Posts: 11,261
Reputation: 2024
Max_87 has a reputation beyond reputeMax_87 has a reputation beyond reputeMax_87 has a reputation beyond reputeMax_87 has a reputation beyond reputeMax_87 has a reputation beyond reputeMax_87 has a reputation beyond reputeMax_87 has a reputation beyond reputeMax_87 has a reputation beyond reputeMax_87 has a reputation beyond reputeMax_87 has a reputation beyond reputeMax_87 has a reputation beyond repute
Rep Power: 37
Default

Depends on what you use it for
__________________
Max_87
Tech ARP
http://www.techarp.com

P4 630 / Abit IP35 Pro / G.Skill F2-8000CL5-4GBPQ / Radeon X1800 / Barracuda 7200.9 120GB / 7200.10 320GB x2 / Caviar SE16 WD5000AAKS / WD6400AAKS x2 / Dell 2007FP x2 / Silverstone ST56F
Max_87 is offline   Reply With Quote
Old 10th Jan 2007, 10:02 AM   #4 (permalink)
ARP Webmaster
 
peaz's Avatar
 
Join Date: 13 Oct 2002
Location: http://atpeaz.placidthoughts.com/
Posts: 8,500
Reputation: 1633
peaz has a brilliant futurepeaz has a brilliant futurepeaz has a brilliant futurepeaz has a brilliant futurepeaz has a brilliant futurepeaz has a brilliant futurepeaz has a brilliant futurepeaz has a brilliant futurepeaz has a brilliant futurepeaz has a brilliant futurepeaz has a brilliant future
Rep Power: 31
Default

useful for admins who always get calls of lost password. LOL!
peaz is offline   Reply With Quote
Old 10th Jan 2007, 10:37 AM   #5 (permalink)
Administrator
 
Chai's Avatar
 
Join Date: 6 Oct 2002
Location: Maranello
Posts: 26,668
Reputation: 3984
Chai has a reputation beyond reputeChai has a reputation beyond reputeChai has a reputation beyond reputeChai has a reputation beyond reputeChai has a reputation beyond reputeChai has a reputation beyond reputeChai has a reputation beyond reputeChai has a reputation beyond reputeChai has a reputation beyond reputeChai has a reputation beyond reputeChai has a reputation beyond repute
Rep Power: 72
Default

Quote:
Originally Posted by peaz View Post
useful for admins who always get calls of lost password. LOL!
Luckily we have AD...
__________________
Chai (Contributor & Forum Admin)
http://www.techarp.com/
Chai is online now   Reply With Quote
Old 11th Jan 2007, 12:34 AM   #6 (permalink)
Da Boss
 
Join Date: 10 Oct 2002
Location: In front of my BenQ Joybook 7000 notebook!
Posts: 29,939
Reputation: 2958
Adrian Wong has a reputation beyond reputeAdrian Wong has a reputation beyond reputeAdrian Wong has a reputation beyond reputeAdrian Wong has a reputation beyond reputeAdrian Wong has a reputation beyond reputeAdrian Wong has a reputation beyond reputeAdrian Wong has a reputation beyond reputeAdrian Wong has a reputation beyond reputeAdrian Wong has a reputation beyond reputeAdrian Wong has a reputation beyond reputeAdrian Wong has a reputation beyond repute
Rep Power: 65
Default

Hmm.. Is this based on the dictionary? Or just brute-force?
__________________
Dr. Adrian Wong
Tech ARP | Blog @ Tech ARP | The Free Trade Zone


DYKT : The only offshore account I have is at the sand bank?

Keep Tech ARP free! Visit our sponsors!

We need PROGRAMMERS and TECHNICAL WRITERS! Contact us if you are a hot shot programmer or technical writer!

My items for sale : 50x SD Card | Memory Stick PRO | Cyclone Energy Saver | Seiko SS watch | Tiger/Carlsberg beer jugs | Travel Speakers | Motorola V600 | Nokia N90 SOLD! | New Lowepro Mini Trekker AW

Other items for sale @ the FTZ : Zalman CNPS9500 LED @ $20 | Zalman CNPS7700 Cu @ $20 | Zalman CNPS7000 Cu @ $20 | Swarovski bracelet watches | Dell 17" LCD | Hi-Fi speakers | English DIVX movies | HP LaserJet toners! | Office chairs
Adrian Wong is offline   Reply With Quote
Old 11th Jan 2007, 07:20 AM   #7 (permalink)
I'm a regular
 
Join Date: 3 Mar 2005
Posts: 464
Reputation: 142
jamotto will become famous soon enoughjamotto will become famous soon enough
Rep Power: 5
Default

It's Greek to me, but maybe some one will understand it.

Quote:
Rainbow tables are a refinement of an earlier, simpler, but less efficient algorithm that used the inversion of hashes by looking up precomputed hash chains.

Each table depends on the hash function and the reduce function used. The reduce function is a surjective ("onto") function which maps a hash to a password using the desired character set and password length. Therefore, a reduce function for lowercase alphanumeric passwords of 8 characters length is different than a reduce function for case-sensitive alphanumeric passwords of 5-16 characters length.

A chain is a sequence of passwords. A starting password is chosen, and the following is done to get the next one in the chain:

reduce( hash(a password) ) -> next password

After a chain containing a suitable number of passwords is created, the final password in the chain is hashed, and the final hash and the starting password are stored together in the rainbow table.

To reverse a hash, look for it in the table. If it isn't found, the following is done to get another hash to try:

hash( reduce(a hash) ) -> next hash


This is repeated until a hash is finally found in the table.

When a match is found, the original password that started the chain that ended with that hash can then be used to generate all the other passwords, and hence hashes, in the chain. Each of the hashes thus generated will be checked to against the original target hash, thus hopefully revealing the correct password.

The end result is a table that contains statistically high chance of revealing a password within a short period of time, generally less than a minute. The success probability of the table depends on the parameters used to generate it. These include the character set used, password length, chain length, and table count.

Success probability is defined as the probability that the plaintext can be found for a given ciphertext. In the case of passwords, the password is the plaintext, and the hash of the password is the ciphertext, so the success probability is the probability that the original password can be recovered from the password hash.
Link
jamotto is offline   Reply With Quote
Old 11th Jan 2007, 08:42 AM   #8 (permalink)
Da Boss
 
Join Date: 10 Oct 2002
Location: In front of my BenQ Joybook 7000 notebook!
Posts: 29,939
Reputation: 2958
Adrian Wong has a reputation beyond reputeAdrian Wong has a reputation beyond reputeAdrian Wong has a reputation beyond reputeAdrian Wong has a reputation beyond reputeAdrian Wong has a reputation beyond reputeAdrian Wong has a reputation beyond reputeAdrian Wong has a reputation beyond reputeAdrian Wong has a reputation beyond reputeAdrian Wong has a reputation beyond reputeAdrian Wong has a reputation beyond reputeAdrian Wong has a reputation beyond repute
Rep Power: 65
Default

Wow.. It's Greek to me too!

But this sounds good - "The end result is a table that contains statistically high chance of revealing a password within a short period of time, generally less than a minute."
__________________
Dr. Adrian Wong
Tech ARP | Blog @ Tech ARP | The Free Trade Zone


DYKT : The only offshore account I have is at the sand bank?

Keep Tech ARP free! Visit our sponsors!

We need PROGRAMMERS and TECHNICAL WRITERS! Contact us if you are a hot shot programmer or technical writer!

My items for sale : 50x SD Card | Memory Stick PRO | Cyclone Energy Saver | Seiko SS watch | Tiger/Carlsberg beer jugs | Travel Speakers | Motorola V600 | Nokia N90 SOLD! | New Lowepro Mini Trekker AW

Other items for sale @ the FTZ : Zalman CNPS9500 LED @ $20 | Zalman CNPS7700 Cu @ $20 | Zalman CNPS7000 Cu @ $20 | Swarovski bracelet watches | Dell 17" LCD | Hi-Fi speakers | English DIVX movies | HP LaserJet toners! | Office chairs
Adrian Wong is offline   Reply With Quote
Old 11th Jan 2007, 09:32 AM   #9 (permalink)
Administrator
 
Chai's Avatar
 
Join Date: 6 Oct 2002
Location: Maranello
Posts: 26,668
Reputation: 3984
Chai has a reputation beyond reputeChai has a reputation beyond reputeChai has a reputation beyond reputeChai has a reputation beyond reputeChai has a reputation beyond reputeChai has a reputation beyond reputeChai has a reputation beyond reputeChai has a reputation beyond reputeChai has a reputation beyond reputeChai has a reputation beyond reputeChai has a reputation beyond repute
Rep Power: 72
Default

Wow, greek, but impressive!
__________________
Chai (Contributor & Forum Admin)
http://www.techarp.com/
Chai is online now   Reply With Quote
Old 30th Jan 2007, 08:42 AM   #10 (permalink)
Administrator!
 
Dashken's Avatar
 
Join Date: 21 Apr 2003
Location: Penang
Posts: 29,725
Reputation: 2162
Dashken has a reputation beyond reputeDashken has a reputation beyond reputeDashken has a reputation beyond reputeDashken has a reputation beyond reputeDashken has a reputation beyond reputeDashken has a reputation beyond reputeDashken has a reputation beyond reputeDashken has a reputation beyond reputeDashken has a reputation beyond reputeDashken has a reputation beyond reputeDashken has a reputation beyond repute
Rep Power: 56
Default

Wow... nice...
__________________
| Intel Core 2 Duo E6850 @ 3.2Ghz | ASUS P5B-E Plus | G.SKILL 2x1GB DDR2 800 | 6 HDDs (2TB+ only ) | NVIDIA GeForce 7600GT | Dell E248WFP 24" Widescreen |


Blog : Dashken's I-Blog
Gallery : Dashken's I-Paintings
Dashken is offline   Reply With Quote
Reply


Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Is Microsoft about to release a Windows "kill switch"? fyire News 2 2nd Jul 2006 05:57 PM
Windows Services Exposed adn Expunge kayFX General Software 9 10th Jun 2005 09:32 PM


All times are GMT +8. The time now is 07:05 PM.


Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2008, Jelsoft Enterprises Ltd.
Search Engine Optimization by vBSEO 3.1.0
Copyright © 1998-2007 Tech ARP. All rights reserved.