User's Manual

Internal Encoding
RFI-148 & RFI-900 High Output Power Paging Transmitters User Manual Page 43 of 134
Key Scheme
One per Capcode
One per System
2
Key Selection Freedom
✓
✗
✓
✗
Decrypting
Device
STIEN
Decryption-
capable
(e.g. RFI-
OAD)
Key-
generator
(both
devices)
No key
entry
necessary.
Not currently
supported.
Please
contact
STIEN.
Single user key (both devices)
Use key-generator with an
arbitrary capcode (or other
trusted source) on either
device to derive single
key.
-
Enter key into both devices.
Non-
STIEN
Key-
generator
Use this to
derive keys
for receiver.
Single user key
Use key-generator with an
arbitrary capcode (or other
trusted source) to derive
single key.
-
Enter key into both devices.
Table 11:- Recommended Encryption Key Schemes.
SHARED KEY DERIVATION
To derive a cryptographically secure key, do the following:
1. Enable the encryption feature (ATS220=1).
2. Enable the key generator (ATS222=1)
3. Enter the customer-specific password (ATS225) that will have been provided to you on purchase of the
unit. This will “unlock” access to the encryption keys that will be displayed on capcode entry.
2
Due to the maintenance burden and increased key vulnerability of this scheme (resulting from key compromise), STIEN
discourages its use.