Troubleshooting Guide - Nortel 3050 Troubleshooting Manual

DCE (Data Communications
Equipment)
DER (Distinguished Encoding
Rules)
Digital Certificate
Digital Signature
DIP (Destination IP) Address
DPort (Destination Port)
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Troubleshooting Guide

NN46120-700 01.01 Standard
12 October 2007
A device that communicates with a
Data Terminal Equipment (DTE) in
RS-232C communications.
A process for unambiguously
converting an object specified in
ASN.1 (such as an X.509 certificate,
for example) into binary values for
storage or transmission on a network.
The digital equivalent of an ID card
used in conjunction with a public key
encryption system. Digital certificates
are issued by trusted third parties
known as certificate authorities
(CAs), after verifying that a public
key belongs to a certain owner. The
certification process varies depending
on the CA and the level of certification.
A digital guarantee ensures that a
document has not been altered, if it
was carried in an electronically-sealed
envelope. The "signature" is an
encrypted digest of the text that is sent
with the text message. The recipient
decrypts the signature digest and
also recomputes the digest from the
received text. If the digests match, the
message is proved intact and tamper
free from the sender.
A digital signature ensures that the
document originated with the person
signing it and that it was not tampered
with after the signature was applied.
However, the sender could still be
an impersonator and not the person
he or she claims to be. To verify that
the message was indeed sent by the
person claiming to send it requires a
digital certificate (digital ID) which is
issued by a certification authority.
The destination IP address of a frame.
The destination port number, linking
the incoming data to the correct
service. For example, port 80 for
HTTP, port 443 for HTTPS, port 995
for POP3S.