Requirement 3 of the PCI DSS is about securing stored cardholder data, and six sub-requirements provide detailed guidelines for how merchants should store the various pieces of information on a card.
At the heart of the PCI DSS is the need to safeguard any cardholder data you carry. The standard includes examples of acceptable data security methods for card holders, such as encryption, tokenization, truncation, masking, and hashing.
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