Version 3R2
Security Appliance User Guide
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LOSSARY
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1000Base-T:
The specification that describes the use of Gigabit
Ethernet over copper Cat-5 wire. It defines data rates of 1 Gigabit per
second (Gb/s) over a distance not to exceed 100 meters.
Advanced Encryption Standard (AES):
An emerging encryption
standard that can use a 128-, 192-, or 256-bit encryption key. This new
standard supports easier interoperability with other security appliances
as it becomes widely adapted.
Address Resolution Protocol (ARP):
A protocol used to map an
internal IP address to physical machines that a local network recognizes.
A table called an ARP Cache stores and correlates the IP address and
physical address assigned for a specific host. ARP provides the protocol
rules for making this correlation and provides address communication in
both directions.
Advertisement:
A method used by routers to send information to other
network devices. This could include an IP address, network mask or
other data.
Authentication Header (AH):
A method that provides integrity and
authentication, but not privacy, as IP data is not encrypted. AH contains
an authentication value based on a symmetric-key hash function.
Bridge:
A device that enables the connection of multiple network
segments while using the same network and mask.
Data Encryption Standard (DES):
A standard that uses either a 40 or
56 bit encryption algorithm developed by the National Institute of
Standards and Technology (NIST). DES uses a block encryption method
that was originally developed by IBM in the 1970s. The U. S.
Government has since certified it to transmit data that has not been as
classified “top secret.” DES uses a 64-bit key to encrypt and decrypt data
into 64-bit block enabling it fixed output for variable length input.
Data Encryption Standard-Cipher Block Chaining (DES-CBC):
Standard that enables the use of Triple DES (or 3DES). By enabling CBC,
the DES encryption occurs three times, enabling generation of the 56-bit
key three times. The 3DES standard uses a key length of 168-bits.
Datagram:
A self contained data packet sent over an IP network.
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