Ah, got it. Here's a
link from the My Opera Forums. The error is
supposed to read "The site is using an outdated encryption method", but there was a last-minute bug.
One thing that trips this message is a "RSA/DH keys shorter than 900 bits", and this one is only 512 bits.
Quote:
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Several years ago a 512 bit RSA key was broken in, effectively, 10-12 weeks (they used 7-8 months computing by night on a few hundred workstations). Today the same job could probably be done in less than 4 weeks, possibly much less depending on how many computers you throw at it, and other improvements in the art of factoring large numbers). Since such a key is usually used for at least one year that means that keys of this length was no longer adequate protection for any information that needed to be kept secure for more than a few weeks.
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I'd say, you are probably OK using this website. You might want to send the above link to the site admin for his comment, however.