User's Guide

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plenum: A compartment or chamber to which one or more air ducts are connected.
plenum-rated cable: A type of cable approved by an independent test laboratory for
installation in ducts, plenums, and other air-handling spaces.
PMK: pair-wise master key. A code derived from a master secret and used as an encryption key
for IEEE 802.11 encryption algorithms. A PMK is also used to derive a pair-wise transient key
(PTK) for IEEE 802.11i robust security.
PoE: Power over Ethernet. A technology, defined in the IEEE 802.3af standard, to deliver
power over the twisted-pair Ethernet data cables rather than power cords.
Point-to-Point Tunneling Protocol (PPTP): A protocol from Microsoft that is used to create
a virtual private network (VPN) over the Internet. It uses Microsoft's Point-to-Point Encryption
(MPPE), which is based on RSA's RC4. It only uses static keys and should not be used to secure
WLANs.
pre-master secret: A key generated during the handshake process in Transport Layer Security
(TLS) protocol negotiations and used to derive a master secret.
private key: In cryptography, one of a pair of keys, one public and one private, that are created
with the same algorithm for encrypting and decrypting messages and digital signatures. The
private key is provided to only the requestor and never shared. The requestor uses the private
key to decrypt text that has been encrypted with the public key by someone else. See also public
key.
PSK: pre-shared key. The IEEE 802.11 term for a shared secret, also known as a shared key.
PTK: pair-wise transient key. A value derived from a pair-wise master key (PMK) and split into
multiple encryption keys and message integrity code (MIC) keys for use by a client and server as
temporal session keys for IEEE 802.11i robust security.
public key: In cryptography, one of a pair of keys, one public and one private, that are created
with the same algorithm for encrypting and decrypting messages and digital signatures. The
public key is made publicly available for encryption and decryption.
RADIUS: remote authentication dial-in user service. A client-server security protocol described
in RFC 2865 and RFC 2866. Developed to authenticate, authorize, and account for dial-up
users, RADIUS has been widely extended to broadband and enterprise networking. The
RADIUS server stores user profiles, which include passwords and authorization attributes.
RC4: Rivest cipher 4. A common encryption algorithm, designed by RSA., used by the Wired-
Equivalent Privacy (WEP) protocol and Temporal Key Integrity Protocol (TKIP).