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Not all communications around keys are of a sensitive nature. Virtually daily, we will communicate keys internally in order to clarify details regarding some activity. Applying AES to keys internally would only serve to hinder our operations & support efforts.

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How often are you verbally communicating primary keys/id's internally within an organization?

I've never understood arguments against guid's, except for table performance with databases that might take a performance hit because of either inserts, or because data won't necessarily be partitioned in the "correct" order (e.g. MySQL writes to buffer pools).

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