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Appendix B: Glossary
high-speed packet access (HSPA)
: A third-generation group of protocols, based on the Universal Mobile Telecommunications
System (UMTS). HSPA provides high speed, high data capacity, and high reliability for packet transmission.
Also see high-speed downlink packet access.
HMAC : See Hashed Message Authentication Code.
HSDPA
: See high-speed downlink packet access.
HSPA
: See high-speed packet access.
hybrid cryptography
: See combined cryptography.
IETF
®
: See Internet Engineering Task Force.
IKE : See Internet Key Exchange.
IKEv1 : See Internet Key Exchange.
IKEv2 : See Internet Key Exchange.
International Telecommunication Union (ITU) : A United Nations autonomous specialized agency studying information tech-
nology, including communication. Membership in ITU is open to governmental and private entities interested in developments in
communication. Also see International Telecommunication Union, Telecommunication Standardization Sector.
International Telecommunication Union, Telecommunication Standardization Sector (ITU-T)
: An ITU group that
coordinates development of international standards. ITU-T releases Recommendations, which are not mandatory standards.
However, individual governments can require adherence to one or more Recommendations.
NOTE: ITU-T was formerly known as the International Telegraph and Telephone Consultative Committee (CCITT, Comité
consultatif international téléphonique et télégraphique).
International Telegraph and Telephone Consultative Committee (CCITT) : A former name for the International
Telecommunication Union, Telecommunication Standardization Sector.
NOTE: The acronym CCITT derives from the equivalent former French name, Comité consultatif international téléphonique
et télégraphique.
Internet Engineering Task Force (IETF
®
)
: An international organization concerned with the function and development of the
internet. IETF maintains a series of RFCs. RFC 3935 describes IETF’s purpose.
Internet Key Exchange (IKE) (IKEv1, IKEv2) : A protocol that negotiates authentication methods, encryption methods, and keys.
It can also negotiate the length of time that a key is valid before a new key must be implemented. IKE version 1 (IKEv1) and IKE
version 2 (IKEv2) use different processes for exchanges.
IPsec : See IP Security Protocol.
IP Security Protocol (IPsec, IPSEC)
: A protocol to protect IP transmissions (for example, in VPNs). IPsec comprises two protocols
that may be applied separately or together:
• Authentication Header (AH)
• Encapsulating Security Protocol (ESP)
NOTE: In IPsec VPNs, the tunnel mode varies during VPN transmission: IPsec can use main mode or aggressive mode to set up the
tunnel, then quick mode for communication through the tunnel. An IPsec VPN tunnel can also function in transport mode.
Also see virtual private network, VPN tunneling.
ITU : See International Telecommunication Union.
ITU-T : See International Telecommunication Union, Telecommunication Standardization Sector.