Internet Express for Tru64 UNIX Version 6.8 Administration Guide (14233)

Multipurpose
Internet Mail
Extensions
See MIME.
MX record Mail Exchange Record. A Domain Name System (DNS) resource record type, indicating which
host can handle electronic mail for a particular domain.
Network News
Transfer Protocol
See NNTP.
newsgroup A hierarchical subject category into which InterNetNews articles are organized.
NNTP Network News Transfer Protocol. A protocol for the distribution, inquiry, retrieval, and posting
of Usenet news articles over the Internet. NNTP is an ASCII text protocol that lets you connect
to the server using telnet if you do not have a news reader program.
POP Post Office Protocol. A protocol that allows single-user hosts to read electronic mail from a
server.
port A logical channel in a communications system.
private key The part of the key in a public key system that is kept secret and is used only by its owner. This
is the key used for decrypting messages and for making digital signatures. Compare with public
key.
public key The part of the key in a public key system that is distributed widely and is not kept secure. This
is the key used for encryption (as opposed to decryption) or for verifying signatures. Compare
with private key.
public key
cryptography
Public key cryptography uses a key for encryption and a different key for decryption. Although
the keys are related, it is not possible to calculate the decryption key from only the encryption
key in any reasonable amount of computation time. In most practical systems, the public key
system is used for encoding a session key which is used with a symmetric system to encode
the actual data. RSA is an example of a public key algorithm.
RDN See relative distinguished name.
relative
distinguished
name
One or more attribute/value pairs stored on an LDAP server that uniquely identify an entry
from its sibling in an object tree.
Resolver library A BIND library that sends queries to one or more name servers and interprets the responses.
See BIND.
secret key Part of a symmetric cipher in which the same key is used for encryption and decryption. A
secure method by which the sender and recipient can agree on the key, SSL encryption uses a
secret-key nested within a public key and authenticated through certificates. Secret-key
encryption provides faster access than public-key encryption alone. See also public key
cryptology.
Secure Socket
Layer
See SSL.
Sendmail Mail
Transport Agent
The BSD Mail Transport Agent supporting e-mail transport by means of TCP/IP using SMTP.
See also BSD, SMTP.
session key A key used for one message or set of messages. In a typical system, a random session key is
generated for use with a symmetric algorithm to encode the bulk of the data. Only the session
key is communicated using public key encryption. See also public key cryptology.
SHTTP Secure Hypertext Transfer Protocol. Provides security at the document level rather than the
connection level as provided by SSL. This protocol is not widely used.
See also HTTPS.
SMTP Simple Mail Transport Protocol. A protocol used to transfer electronic mail between computers,
usually over the Internet. SMTP is a server-to-server protocol; other protocols are used to access
messages.
SSL Secure Socket Layer. A protocol developed by Netscape for encrypted transmission over TCP/IP
networks. SSL sets up a secure end-to-end link over which HTTP or any other application
protocol can operate. The most common application of SSL isHTTPS for SSL-encrypted HTTP.
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