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This question already has an answer here:

What is the industry standard for sharing credit card data between client (thin & thick) and server?

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marked as duplicate by Rory Alsop Feb 9 '13 at 11:37

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

Sounds like you're looking for the PCI-DSS – John Downey Feb 8 '13 at 13:58
@JohnDowney - you should turn that into an answer. I'm sure that would be an easy one to flush out. – David Feb 8 '13 at 14:16

Not sure why he didn't put it as an answer, but John Downey is correct, the PCI-DSS is what you are looking for. It is the industry standard for protection of PCI (credit card details) in transit and at rest (in storage).

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