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Re:Environment Variables Considered Harmful for Your Secrets by Someone on Saturday January 03, 2015 @10:48AM (#8830981)
For the Mac OS X technology, https://developer.apple.com/library/mac/documentation/Securi... is a good starting point.

I don't know of full open source equivalents. Parts of Apple's code are open source, though, for example http://opensource.apple.com/source/security_systemkeychain/s... (may not even compile; not all Apple's open source releases do)

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