Which encryption key is specifically used to protect traffic as it is transmitted?

Which encryption key is specifically used to protect traffic as it is transmitted?

• A. Traffic Encryption Key (TEK)
• B. Key Encryption Key (KEK)
• C. Transmission Security Key (TSK)
• D. Simple Key Loader (SKL)

Answer: (A)

The message traffic is protected by a key dedicated to encrypting the actual transmitted data. This key is the Traffic Encryption Key. It is the key used by the radio’s encryption algorithm to turn plaintext into ciphertext as it leaves the transmitter and to decrypt incoming ciphertext at the receiver. In practice, TEKs are refreshed regularly to keep communications secure. Other options serve different roles: a Key Encryption Key protects TEKs themselves, typically during storage or transit (not the traffic itself); a Transmission Security Key isn’t the standard term for encrypting the payload in this context; and a Simple Key Loader is a device used to load keys, not a cryptographic key itself. So the traffic in transit is protected by the Traffic Encryption Key.

The message traffic is protected by a key dedicated to encrypting the actual transmitted data. This key is the Traffic Encryption Key. It is the key used by the radio’s encryption algorithm to turn plaintext into ciphertext as it leaves the transmitter and to decrypt incoming ciphertext at the receiver. In practice, TEKs are refreshed regularly to keep communications secure.

Other options serve different roles: a Key Encryption Key protects TEKs themselves, typically during storage or transit (not the traffic itself); a Transmission Security Key isn’t the standard term for encrypting the payload in this context; and a Simple Key Loader is a device used to load keys, not a cryptographic key itself.

So the traffic in transit is protected by the Traffic Encryption Key.