128 Encryption11 EncryptionThis section describes how to use encryption to makeyour communications completely private.This feature is controlled by a software license(SFE) and may not be available with your radio.This section covers:■ About encryption■ Encrypting calls■ Making an encrypted call■ Receiving an encrypted call■ Changing the radio’s encryption key■ Removing encryption keys from the radio■ Updating encryption keys over-the-air■ Using an encryption demonstration key