Which approach is NOT part of using strong cryptography to safeguard cardholder data during transmission?

The focus of strong cryptography in safeguarding cardholder data during transmission is to ensure that sensitive information is protected from unauthorized access and potential breaches. The use of strong cryptographic measures includes several best practices.

Implementing outdated encryption protocols is contrary to the principles of strong cryptography. Outdated protocols are often vulnerable to various attacks and may not offer the level of security necessary to protect cardholder data effectively. Modern encryption algorithms and protocols are designed to fend off contemporary threats, making it essential to use updated versions that comply with current security standards.

On the other hand, accepting only trusted keys and certificates, ensuring that the encryption strength is appropriate, and using secure versions of protocols are essential practices for maintaining robust security. Trusted keys and certificates authenticate the parties involved in the data exchange, while appropriate encryption strength guarantees that the data remains confidential during transmission. Secure versions of protocols ensure that known vulnerabilities are mitigated, providing an additional layer of protection against potential attacks.