PCI DSS requirement 4.1 requires the use of secure sockets layer (SSL) or other strong cryptography to protect cardholder data while in transit over public networks. Specifically, the standard requires that:

”Use strong cryptography and security protocols such as secure sockets layer (SSL) / transport layer security (TLS) and Internet protocol security (IPSEC) to safeguard sensitive cardholder data during transmission over open, public networks.”

In this article, we take a look at what this means for you as a PCI DSS professional.  We begin with an overview of how the Secure Sockets Layer (SSL) works, define an “open, public network” and then explore what you need to do to validate your PCI DSS compliance in this area.

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