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Category: PCI DSS Requirement 4
Encrypt transmission of cardholder data across open, public networks.
PCI DSS Requirement 4 states that in order to protect sensitive cardholder data such as credit or debit cards, it should be encrypted whenever transmitted over untrusted networks. Typically, open and public networks are always considered untrusted and thus an encrypted pipe or encryption of the data in transmission should be utilized. This is particularly relevant to cardholder data traversing the Internet or wireless networks.