Which of the following is NOT an issue of key management?

Key management focuses on how cryptographic keys are handled throughout their lifecycle, including creation, distribution, storage, and destruction. The issues related to key management generally encompass trust, availability, and integrity because these components are essential for ensuring that cryptographic systems function securely and effectively.

Trust pertains to the assurance that the parties involved in the key management process can be relied upon to handle keys responsibly. Availability refers to ensuring that cryptographic keys are accessible when needed, while integrity ensures that keys are not tampered with or altered in an unauthorized manner. These are critical for maintaining the overall security of any cryptographic solution.

On the other hand, ACL (Access Control List) is a method of defining permissions for a particular resource, which primarily governs who can access specific data and resources rather than directly managing cryptographic keys themselves. While ACLs are important for data security and can complement key management, they are not inherently a key management issue. Therefore, it stands out as unrelated to the core concerns of managing cryptographic keys effectively.