Advertisement
BACK - Barricade Plus IPSec Tunnels
SECTION 6: Glossary
3DES
This is a cryptographic algorithm for repeated DES operations that have the effect of
increasing the security of the encrypted message.
AH
The Authentication Header is a traditional IP packet consists of an IP header and a
payload, which can consist of a TCP or UDP header and data. If the AH is used, it
immediately follows the IP header. At the end of the AH is the authentication data, which
is a digital signature for the packet. To authenticate users, AH can use MD5 or SHA1
DES
(Data Encryption Standard) This is a cryptographic encryption algorithm that is part of
many standards.
DHCP
(Dynamic Host Configuration Protocol) This protocol automatically configures the TCP/IP
settings of every computer on your home network.
DNS
DNS stands for Domain Name System, which allows Internet host computers to have a
domain name (such as www.smc.com) and one or more IP addresses (such as
192.34.45.8). A DNS server keeps a database of host computers and their respective
domain names and IP addresses, so that when a domain name is requested (as in typing
" www.smc.com" into your Internet browser), the user is sent to the proper IP address.
The DNS server address used by the computers on your home network is the location of
the DNS server your ISP has assigned.
ESP
Encapsulating Security Payload is the protocol that handles encryption of IP data at the
packet level. It uses symmetric or secret key, cryptographic algorithms like Data
Encryption Standard (DES), and triples DES to encrypt the payload.
IP Address
IP stands for Internet Protocol. An IP address consists of a series of four numbers
separated by periods, that identifies an single, unique Internet computer host. Example:
192.34.45.8.
Advertisement
