[Rails] obfuscating sensitive data

In our app, users give us sensitive information (credentials for
logging into a third party site). At some point, we need those
credentials in cleartext in order to access the third party site, but
while they're in our database, we want to make best effort for
protecting them.

What techniques have people used for this? I find myself asking "WWMD
(What Would Mint.com Do?) -- any suggestions?

- ff

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