What encryption device is capable of loading up to 500 keys?

The AN/CYZ-10, also known as the Data Transfer Device (DTD), is specifically designed for secure communications and data transfer in military and secure environments. Its capability to handle up to 500 keys makes it particularly useful for organizations that require a robust method of key management for cryptographic operations. This number allows for greater flexibility in operations, enabling secure communications among various units and systems without the need to frequently download or manage keys.

In contrast, while other options like the AN/CYZ-20, Secure DTD1000 System, and Secure DTD2000 System are also related to secure data transfer and management, they have different specifications regarding key management capacity or might serve different operational purposes. For example, the higher model numbers typically refer to devices with increased capabilities or advanced features, but the AN/CYZ-10's specific capacity of 500 keys remains a notable characteristic that defines it in the context of encryption devices.