Instruction Manual
122
TERM MEANING
Certificate Authority
A Certificate Authority is a trusted third party,
which certifies public key's to truly belong to their
claimed owners. It is a key part of any Public Key
Infrastructure, since it allows users to trust that a
given public key is the one they wish to use, either
to send a private message to its owner or to verify
the signature on a message sent by that owner.
Certificate
Revocation List
A list of certificates that have been revoked by the
CA before they expired. This may be necessary if
the private key certificate has been compromised
or if the holder of the certificate is to be denied
the ability to establish a connection to the IMG/IM/
CM4000.
CHAP
ChallengeHandshake Authentication Protocol
(CHAP) is used to verify a user's name and
password for PPP Internet connections. It is more
secure than PAP, the other main authentication
protocol.
DHCP
Dynamic Host Configuration Protocol. A
communications protocol that assigns IP
addresses to computers when they are connected
to the network.
DNS
Domain Name System that allocates Internet
domain names and translates them into IP
addresses. A domain name is a meaningful and
easy to remember name for an IP address.
DUN
Dial Up Networking
Encryption
The technique for converting a readable message
(plaintext) into apparently random material
(ciphertext) which cannot be read if intercepted.
The proper decryption key is required to read the
message.
Ethernet
A physical layer protocol based upon IEEE
standards