478 Chapter 15
Cryptographic Suite A Cryptographic Suite is a set of methods for data authentication,
data encryption, and key exchange. The standard allows for five different Cryptographic
Suites as shown in Table 15.1.
Among the two data encryption methods supported, CBS-mode DES is not considered
a very strong encryption method. The only benefit it offers over the AES method is
that the data size is not expanded by the encryption process. The AES method, on the
other hand, has been widely accepted as a very strong encryption technique.
PHY
The Physical Layer Protocol (PHY) defines the technical details of the use of the
physical layer medium for communication and dictates the spectral efficiency of the
protocol. The MAC layer protocol of WiMAX was designed to be mostly independent
of the details of the Physical (PHY) Layer Protocol in general, allowing for the development
of a diverse set of PHY standards, each optimized for a different type of
application. As a consequence of this principle, several PHY standards have been
developed as the acceptance of WiMAX has grown for a wider set of applications
since its origin.
During the early stages of the standard??™s development, the primary application of the
technology was for fixed??“wireless extensions of fiber as well as PMP backhaul of cell
sites.
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