Requirement 3.3 emphasizes masking what type of data when displayed?

Requirement 3.3 focuses on the need to mask Primary Account Numbers (PAN) when displayed to ensure the security of sensitive information. The PAN is a critical component of credit card information, and its exposure can lead to unauthorized use and fraud. By masking this number, organizations can significantly reduce the risk of data breaches and protect consumers' financial information.

Masking typically involves replacing some digits of the PAN with symbols or digits, such as displaying only the last four digits while the rest are hidden. This practice is essential because it ensures that even if unauthorized individuals gain access to systems or displays, they cannot easily use the full credit card information for fraudulent activities.

Presenting full credit card numbers or including all elements like expiration dates and security codes without any masking could lead to potential misuse. Therefore, the emphasis on masking the PAN aligns with best practices in data protection within the realm of payment card security standards.