WebApp Sec: Re: MD5 math question

[Tim <tim-security () sentinelchicken org>]

> Without knowing the correct password there is no way of knowing that the 
> collision isn't it, and from a practical point of view it doesn't matter 
> in the slightest.
Very true.

> Considering the fact that MD5 has been broken though, I'm fairly 
> surprised it even came up to discussion. It's not exactly hard to find 
> info or even collision-generators.
See... People keep bringing this up, and it is true, MD5 has been
shattered when it comes to collision resistance, but this is not the
same as pre-image or second pre-image resistance.  I don't believe
either of those are broken yet for MD5 (please link me if I am wrong),
so I think this is still a valid discussion, and applicable other hash
algorithms as well.


> As for not using salts, read this. You'll change your mind.
> http://discuss.develop.com/archives/wa.exe?A2=ind0301b&L=advanced-dotnet&T=0&F=&S=&P=4424
Indeed.  Always use salts.  This is one reason LM hashes can be
reversed so readily.


tim

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