PMP 450 Configuration and User Guide
Task 5: Configuring security
pmp-0050 (May 2012)
2-57
Encrypting radio transmissions
Motorola fixed wireless broadband IP systems employ the following forms of encryption for security of the
wireless link:
DES–Data Encryption Standard, an over-the-air link option that uses secret
56-bit keys and 8 parity bits.
AES–Advanced Encryption Standard, an extra-cost over-the-air link option that provides extremely
secure wireless connections. AES uses 128-bit secret keys as directed by the government of the U.S.A. AES
is not exportable and requires a special AP to process the large keys.
DES Encryption
Standard modules provide DES encryption. DES performs a series of bit permutations, substitutions, and
recombination operations on blocks of data. DES Encryption does not affect the performance or throughput of
the system.
AES Encryption
Motorola also offers fixed wireless broadband IP network products that provide AES encryption. AES uses the
Rijndael algorithm and 128-bit keys to establish a higher level of security than DES. Because of this higher
level of security, the government of the U.S.A. controls the export of communications products that use AES
(among which the AES feature activation key is one) to ensure that these products are available in only certain
regions and by special permit.
The distributor or reseller can advise service providers about current regional availability. AES products are
certified as compliant with the Federal Information Processing Standards (FIPS) in the U.S.A. The National
Institute of Standards and Technology (NIST) in the U.S.A. has specified AES for significantly greater security
than that which DES provides. NIST selected the AES algorithm for providing the best combination of
security, performance, efficiency, implementation, and flexibility. NIST collaborates with industry to develop
and apply technology, measurements, and standards.
AES-DES Operability Comparisons
This section describes the similarities and differences between DES and AES products, and the extent to which
they may interoperate.
Feature Availability
AES products run the same software as DES products. Thus feature availability and functionality are and will
continue to be the same, regardless of whether AES encryption is enabled. All interface screens are identical.
However, when encryption is enabled on the Configuration screen
the AES product provides AES encryption.
the DES product provides DES encryption.
AES and DES products use different FPGA (field-programmable gate array) loads. However, the AES FPGA
will be upgraded as needed to provide new features or services similar to those available for DES products.
Summary of Contents for PMP 450
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