Asymmetric Key sizes

[Bob Askwith]

happened to see this just today...

RSA 140 factored (465 bits)
http://jya.com/rsa140.htm

At 15:02 10/02/99 -0000, you wrote:
>Although a lot is being said about the shrinking level of security offered
>by various symmetric key sizes, with 56 bits coming in for a lot of stick,
>haven't seen anything lately on asymmetric attacks. Has anyone any
>information on the latest successful attack position on asymmetric keys, RSA
>in particular? How secure is 512 bits considered now, and why? What's the
>current recommended key size? Has anything been published that is later than
>the now rather old (January 1996) "Report by the Ad Hoc Group of
>Cryptographers and Computer Scientists"?

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Cheers,
Bob.