On Sep 24, 2009, at 12:30 PM, M.B.Jr. wrote:
Hi David,
about the first "tidbit":
On Tue, Sep 22, 2009 at 6:08 PM, David Shaw <ds...@jabberwocky.com>
wrote:
First of all, someone has factored a 512-bit RSA key (the one used to
protect a TI programmable calculator, it seems). It took 73 days
on a
dual-core 1900Mhz Athlon64. It took just under 5 gigs of storage
and around
2.5 gigs of RAM. In other words: not much at all. It's not some big
distributed project - rather it's a single guy who wanted to factor
it and
just left it running in the background for 2 and a half months.
(This is
actually a month old - forgot to send it before now).
http://www.unitedti.org/index.php?showtopic=8888
dummy question:
by factoring a public key integer, one can get somehow to its
corresponding private key?
Yes, that's exactly what happens. If you factor the public key, you
can derive the private key.
In the case above, it seems TI was using that 512-bit key to ensure
that only TI could generate software images for their calculator.
With the key factored, anyone can sign a software image.
David
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