Documentation of cryptographic architecture should include which of the following?

The most comprehensive and effective documentation of cryptographic architecture includes detailed information on the algorithms, protocols, and keys utilized. This is important because each component plays a critical role in ensuring the security and integrity of cryptographic practices.

Including detailed algorithms allows an organization to understand the strength and weaknesses of the encryption methods in use. This information is necessary for assessing the security posture and compliance with standards like PCI DSS. Protocols provide context on how these algorithms are applied within the system, detailing the processes that govern encrypted communications. Additionally, documenting keys is crucial as they are the foundation of cryptographic security; understanding their lifecycle, including creation, storage, rotation, and expiration, is essential to protect sensitive data against unauthorized access.

When considering only the algorithms or focusing solely on keys or expiry dates, the documentation would lack the holistic view needed for effective risk management and compliance. For example, without protocols, the implementation of algorithms cannot be fully evaluated, and without the keys, one cannot assess the operational security of the system. Therefore, the most effective practice is to document all three elements—algorithms, protocols, and keys—to ensure a thorough understanding of the cryptographic architecture in place.