Final answer:
The Crypto Ignition Key (CIK) device is used on SIPRNet to securely store and encrypt cryptographic keys.
Step-by-step explanation:
The Crypto Ignition Key (CIK) device is used on SIPRNet.
The Crypto Ignition Key (CIK) is a small electronic device that securely stores and encrypts cryptographic keys (also known as key material) used for secure communication on the SIPRNet network. It is used to provide secure and authenticated access to classified information.
Without the CIK, users are unable to access the cryptographic keys required to decrypt and encrypt data on SIPRNet. The CIK is a critical component in ensuring the confidentiality, integrity, and availability of sensitive information transmitted over the network.