If he has access to a rainbow table (and if he is interested in your data he 
very likely does) it is inevitable. A rainbow table will provide him with other 
"collision" passwords if it's anything like comprehensive. 

Bob


On Jun 14, 2012, at 4:42 PM, Igor de Oliveira Couto wrote:

> Consider the following scenario: you have stored MD5 hashes (salted or not) 
> to your user's passwords in a database table, which you use in your login 
> system to authenticate and authorise the user. Now, let's say that a clever 
> hacker has managed to break into the 'users' table, and now has the list of 
> hashes for all your users. The question is: how likely is it, that they will 
> be able to come up with *some* string (password/passphrase) that will 
> generate a selected hash from that table?


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