Using The Kvl 3000 - Motorola KEY 3000 User Manual

KVL 3000 User's Guide
Using the
KVL 3000
2-4
Overview of Encryption Concepts
Secure communications systems are designed
to provide coded (encrypted") voice and data
signals between some or all links in the system
(including RF links and network links). In order
to do this, each device (e.g., radio, fixed
encryption unit) is loaded with a multi digit
encryption variable (a key"). This key is used by
the encryption algorithm (e.g., DES, DVI XL,
etc.) built into the device to mathematically
encrypt" all transmitted voice and data signals,
and decode all encrypted" voice and data
signals received.
Only devices in the system with the same
algorithm and encryption key can decode the
encrypted signal and carry on communications
with each other. Talk groups can therefore be
created by controlling the assignment of
encryption keys to specific groups of radios.
Types of Keys
The KVL 3000 stores two basic types of
encryption keys:
D Traffic Encryption Keys (TEK)
by subscriber units to encrypt/decrypt
voice and data communications
D Key Encryption Keys (KEK)
the KMF to provide an additional level of
encryption to the encryption keys when
transferring keys to secure subscriber de
vices (over the air) or indirectly via the
KVL 3000 (using Store and Forward)
Both types of keys are stored in the KVL 3000
memory in an encrypted format and are
protected from tampering.
Used
Used by
ASTRO 25 Operation