## Can someone explain what a Birthday Attack is ?

Cryptography
1
33%
Mathematics
2
67%

Total votes : 3

Jr. Member

Posts: 61

Joined: Mon Jan 15, 2007 8:46 am

Location: India

### Birthday Attack !

Hi,

I am unable to get the exact meaning of birthday attack !

I have gone through many resources and also consulted some people. But never got a explanation.

Maybbe you guys can help !

Thnx !

Last edited by boney on Sun Feb 11, 2007 9:38 am, edited 1 time in total.
C|EH

All my life I wanted a computer...
Now I want my life back !

Hero Member

Posts: 1911

Joined: Mon Dec 11, 2006 3:23 pm

### Re: Birthday Attack !

Where is it referenced? The only thing I can think of is using a birthday/date as a password and someone cracking/guessing that.

Jr. Member

Posts: 61

Joined: Mon Jan 15, 2007 8:46 am

Location: India

### Re: Birthday Attack !

No ....
It has something to do with cryptography !
C|EH

All my life I wanted a computer...
Now I want my life back !

### Re: Birthday Attack !

It has to do with the "birthday paradox" and is a kind of brute-force attack. Its involves both cryptography and mathematics.  It gets its name from the interesting result that more than likely  two or more people in a group of 23 share the same birthday is greater than 50%. As the size of the group increases so does the probability.  It can be an effective attack against some things. If I remember correctly it could take several hundred years to crack MD5 with a birthday attack. Its appealing because it's extremely easy to change document formats. Pretty much every document has some place where you can insert  “hidden data”.
Last edited by Kev on Sun Feb 11, 2007 10:14 am, edited 1 time in total.

Administrator

Posts: 4270

Joined: Sun Aug 28, 2005 10:47 pm

Location: Chicago

### Re: Birthday Attack !

CISSP, MCSE, CSTA, Security+ SME

### Re: Birthday Attack !

For an audio explanation of a birthday attack, Steve Gibson did a nice job explaining it in a Security Now podcast a while back...episode #35.  Acutally the whole series that he did on crypto was very good (not to mention various other topics).

http://www.grc.com/SecurityNow.htm

-M

### Re: Birthday Attack !

Ah yes Google.  The best friend of any hacker and first place to focus your passive information gathering.

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