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Offline Buzzfuzz

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Re: Change your passwords
« Reply #29 from previous page: January 14, 2012, 06:27:31 PM »
VB doesn't anyway, they are salted MD5, unless your not up to date with patches that have security issues.
 
Quote from: Zac67;675781
I hope a.org doesn't store the password hashes unsalted? Reasonably salted hashes are next to impossible to crack (reverse).
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Offline Zac67

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Re: Change your passwords
« Reply #30 on: January 14, 2012, 06:41:45 PM »
 

Offline save2600

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Re: Change your passwords
« Reply #31 on: January 14, 2012, 07:23:47 PM »
Quote from: save2600;675708
The Atari SF354 is the greatest, most useful and most reliable drive on the planet!

I also love the fact it requires it's own external power supply. So kewl!


Looks like someone hacked into my account and posted this drivel. As if *I* would ever say such a thing.  :laughing:





(admins... just kidding - no one hacked into my account. took a proactive stance and changed my password from ataristblowschunks just in case - LOL!)
« Last Edit: January 14, 2012, 07:26:29 PM by save2600 »
 

Offline Piru

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Re: Change your passwords
« Reply #32 on: January 14, 2012, 08:16:18 PM »
Quote from: Zac67;675781
Reasonably salted hashes are next to impossible to crack (reverse).
Unfortunately this is no longer true. Salting is an affective defense against rainbow tables, but there are new tricks in the bag: a single graphics card can try several billion vBulletin salted passwords per second and you can have several cards in a single machine.

In general salting is almost pointless if the attacker can obtain the salts (and typically they do, they're in the same table as the password hashes). Salts of course do raise the amount of work required for cracking but the GPU grunt has leveled the field again.

The solution is to use multi-round hashing of the password + salt.
« Last Edit: January 14, 2012, 08:38:24 PM by Piru »
 

Offline KarlosTopic starter

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Re: Change your passwords
« Reply #33 on: January 14, 2012, 09:27:33 PM »
Quote from: Piru;675798
Unfortunately this is no longer true. Salting is an affective defense against rainbow tables, but there are new tricks in the bag: a single graphics card can try several billion vBulletin salted passwords per second and you can have several cards in a single machine.

In general salting is almost pointless if the attacker can obtain the salts (and typically they do, they're in the same table as the password hashes). Salts of course do raise the amount of work required for cracking but the GPU grunt has leveled the field again.

The solution is to use multi-round hashing of the password + salt.

I've written such a system previously, using a minimal 12 byte (all non-zero values allowed) random salt. The salt is merged into the password and the result hashed repeatedly with one of a number of supported hash functions (bcrypt is nice and slow as a proper alternative that does this stuff already). The salt and variable (up to 65535) iteration count is then encoded into the resulting hash rather than being stored separately. Depending on the settings applied, hashing takes up to 2 seconds on my PC.

It might be an option for this place if the worst comes to the worst, but I'd be reluctant to deploy it unless it was reimplemented in C and deployed as a compiled php extension such that the code is kept away from casual inspection.
« Last Edit: January 14, 2012, 09:41:29 PM by Karlos »
int p; // A
 

Offline tomazkid

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Re: Change your passwords
« Reply #34 on: January 14, 2012, 10:29:42 PM »
Quote from: Piru;675798
Unfortunately this is no longer true. Salting is an affective defense against rainbow tables, but there are new tricks in the bag: a single graphics card can try several billion vBulletin salted passwords per second and you can have several cards in a single machine.

In general salting is almost pointless if the attacker can obtain the salts (and typically they do, they're in the same table as the password hashes). Salts of course do raise the amount of work required for cracking but the GPU grunt has leveled the field again.

The solution is to use multi-round hashing of the password + salt.


Bah, what happened to the traditional Amiga "Security Through Obscurity" approach?
Is it obsoleted now? :D

/more serious mode
Yes, regarding the GPU as you wrote, seems the current trend with GPU used for processing might even make passwords as identification obsolete.
 

Offline actung_bab

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Re: Change your passwords
« Reply #35 on: January 14, 2012, 10:33:09 PM »
Yes my best friend has atrai st nice machine got some cool features too
Acthung baby
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what can i say i like thse machines
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Offline cecilia

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Re: Change your passwords
« Reply #36 on: January 15, 2012, 01:52:49 PM »
Pass the Salt!
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Offline KarlosTopic starter

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Re: Change your passwords
« Reply #37 on: January 15, 2012, 02:05:16 PM »
Quote from: cecilia;675887
Pass the Salt!


ITYM "salt the pass" :)
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Offline swift240

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Re: Change your passwords
« Reply #38 on: January 15, 2012, 04:00:21 PM »
Done it............
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Offline cecilia

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Re: Change your passwords
« Reply #39 on: January 15, 2012, 09:45:30 PM »
Quote from: Karlos;675891
ITYM "salt the pass" :)
:roflmao:
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