What is the first step in loading Keymat into the DMR?

The initial step in loading Keymat into the DMR (Digital Modular Radio) is to zeroise the system. This process ensures that any previous keys or cryptographic information stored in the DMR is completely erased. Zeroising is a critical security procedure because it prevents any potential leakage of sensitive data and guarantees that the new keys being loaded are the only information present in the system. Starting with a clean slate eliminates the risk of inadvertently accessing outdated or compromised key material, which is crucial for maintaining secure communications.

Once the system has been zeroised, the subsequent steps can focus on loading crypto keys, setting fill port modes, or creating CIK keys, but the foundational action of zeroising is essential to safeguard the integrity and security of the entire process.