Expired security certificates and crashing Safari?

Help!  As of a couple of weeks ago, I began receiving the error code "Expired Security Certificate" in Yahoo! mail when trying to Compose a new email.  I was able to send email from my Gmail account, and have had to rely on that.  Now, I cannot even send from Gmail - it causes Safair to crash.  I continue to get the Security warning on Yahoo!  I searched online for fixes, including looking in Utilities and the key folder.  I see the problem keys, but "repair" does not fix them.  The Yahoo! one is dated "Saturday, April 15, 2013" which is obviously incorrect, as today, is Monday, April 15, 2013.
My Safari is also beginning to randomly crash.  I just ran updates, but it didn't see to help.

It could mean a lot of things. Basically, the SSL certificate is there to:
1) Encrypt information between you and the site
2) Provide you with a "statement of trust" of sorts from the CA saying that this server is, in fact, run by "Company XYZ". In this case, your bank.
Certificates expire and must be renewed, so it's entirely possible your bank forgot to renew their certificate. It's also possible that it's not an authentic certificate and the system has been hijacked by some malicious person. The traffic you send to the server will still be encrypted, but it may get sent to somebody other than your bank if the site was hijacked in some way.
It'd probably be best to contact your bank and ask them about it. That way you should be able to get a definitive answer straight from them. If the certificate is correct and verified, just expired, it will still work just fine. I wouldn't log in to the site until you've checked with them, though.

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