4RF Aprisa SR+ User Manual - page 175
Managing the Radio | 173
Aprisa SR+ User Manual 1.5.3
KEY ENCRYPTION KEY SETTINGS
The Key Encryption Key provides the ability to encrypt the Payload Encryption Key so it can be safely
transmitted over the radio link to remote radios.
The Key Encryption Key Type, Key Encryption Key Size and Key Encryption Key must be the same on all
radios in the network.
Key Encryption Key Type
This parameter sets the Payload Encryption Key Type:
Option
Function
Pass Phrase
Use the Pass Phrase password format for standard security.
Raw Hexadecimal
Use the Raw Hexadecimal key format for better security. It
must comply with the specified encryption key size
e.g. if Encryption Type to AES128, the encryption key must
be 16 bytes (32 chars)
The default setting is Pass Phrase.
Key Encryption Key Size
This parameter sets the Encryption Type to AES128, AES192 or AES256. The default setting is AES128.
The higher the encryption type the better the security.
Key Encryption Key
This parameter sets the Key Encryption Key. This is used to encrypt the payload encryption key.
USB Transaction Status
This parameter shows if a USB flash drive is plugged into the radio host port
.
Option
Function
USB Storage Not Detected A USB flash drive is not plugged into the radio host port.
USB Storage Detected
A USB flash drive is plugged into the radio host port.
Note: Some brands of USB flash drives may not work with 4RF radios.
Controls
The ‘Save’ button saves the Key Encryption Key settings to the radio. If the Security Level is set to Strong
(see ‘Security Level’ on page 179), this button will be grayed out.
The ‘Load From USB’ button loads the Key Encryption Key settings from the USB flash drive. If a USB flash
drive is not detected, this button will be grayed out
The ‘Copy To USB’ button copies the Key Encryption Key settings to a file called ‘asrkek.txt’ on the USB
flash drive. This settings file can be used to load into other radios. If a USB flash drive is not detected or
the Security Level is set to Strong (see ‘Security Level’ on page 179), this button will not be shown.