User Manual

Appendix E: Glossary
PSK
E-22
Psion Teklogix 9160 Wireless Gateway User Manual
server. Proxy servers have two main purposes: improve performance by spreading
requests over several machines and filter requests to prevent access to specific
servers or services.
PSK
Pre-Shared Key (PSK), see Shared Key.
Public Key
A public key is used in public key cryptography to encrypt a message which can
only be decrypted with the recipient's private or secret key. Public key encryption is
also called asymmetric encryption, because it uses two keys, or Diffie-Hellman
encryption. Also see Shared Key.
Q
QoS
Quality of Service (QoS) defines the performance properties of a network service,
including guaranteed throughput, transit delay, and priority queues. QoS is designed
to minimize Latency, Jitter, Packet Loss, and network congestion, and provide a
way of allocating dedicated bandwidth for high priority network traffic.
The IEEE standard for implementing QoS on wireless networks is currently in-
work by the 802.11e task group. A subset of 802.11e features is described in the
WMM specification.
R
RADIUS
The Remote Authentication Dial-In User Service (RADIUS) provides an
authentication and accounting system. It is a popular authentication mechanism for
many ISPs.