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->similar difficulty to breaking NIST P-256

which takes our comp sci lab 35 seconds on a cluster of 8 machines.

so still no.

If that's possible, I'm sure you'll have no difficulty finding a public source to cite that states the same.

All the public sources I've found say it is secure.

Except for the ones recommending 512bit EC's

Perhaps you can find the parameters for a 512bit,non NIST EC and we can both be happy?

Otherwise I'll stick with 8000 and 15424 RSA thnx.