Psion Teklogix 9160 G2 Wireless Gateway User Manual E-23
Appendix E: Glossary
Public 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 encry ption 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 design ed
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.

RC4

A symmetric stream cipher provided by RSA Security. It is a variable key-size
stream cipher with byte-oriented operations. It allows keys up to 2048 bits in length.

Roaming

In IEEE 802.11 parlance, roaming clients are mobile client stations or devices on a
wireless network (WLAN) that require use of more than one Access Point (AP) as
they move out of and into range of different base station servic e areas. IEEE 802.11f