[rogerbinns]

This is how these attacks work. Someone comes up with numbers like the above and publish. Others improve on it and the amount of work needed reduces. You can see it happen with hash functions as Valerie Aurora shows (also see the reactions table): http://valerieaurora.org/hash.htm

[dlitz]

Broken link?

[rogerbinns]

Sorry. There should be a trailing 'l' that got dropped when I copy pasted.

[dlitz]

Oops, I thought I'd also tried that correction, but I must have made a typo. :)