Hytera DMR System Planner
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algorithm (e.g.: AES, ARC4), the basic encryption expands the encryption key value
into three types with up to 256 bits. This provides more reliable protection to the
transmitted voice and data, preventing the communications from eavesdropping.
Voice encrypted with this mechanism has the same system access time with
unencrypted voice since no encryption parameter is required to be sent. See the
following figure for the basic encryption flow.
Figure 2.4.3.1-1: Basic Encryption Process
* The key plays an important role in encryption. It is recommended to configure a
unique key, which has at least five different bits from other keys after converted into
binary value; otherwise a warning will pop up. However, this does not affect your
operation.
2.4.3.2 Advanced
Encryption
The advanced encryption provides a safer and more reliable encryption mechanism
and encryption algorithm as introduced below:
1) You can configure the key type (40 bits, 128 bits and 256 bits) and value freely.
2) The advanced encryption with the key of 40 bits adopts ARC4 algorithm to
generate the key stream for conversion of the original voice/data; as for the
advanced encryption with with the key of 128 or 256 bits, it applies AES algorithm to
generate the key stream for the conversion. Even with the same key, the advanced
encryption will provide different key streams to the voice super frames and data
packs, to avoid the attackers grasping the voice or data over the air for decoding the
key.
During the encryption key generation through the algorithm, Hytera will have extra
processing, while DMRA encryption will directly generate the key, as even with the
same value, these two technologies will generate different keys.
Summary of Contents for PD70X Series
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