Oracle B12255-01 - Manual (Page 208)

Glossary-6
PL/SQL
PL/SQL is Oracle’s proprietary extension to the SQL language. PL/SQL adds
procedural and other constructs to SQL that make it suitable for writing
applications.
plaintext
Also called cleartext. Unencrypted data in ASCII format.
port
A port is a number that TCP uses to route transmitted data to and from a particular
program.
private key
In public-key cryptography , this key is the secret key. It is primarily used for
decryption but is also used for encryption with digital signatures. See
public/private key pair .
proxy server
A proxy server typically sits on a network firewall and enables clients behind the
firewall to access Web resources. All requests from clients go to the proxy server
rather than directly to the destination server. The proxy server forwards the request
to the destination server and passes the received information back to the client. The
proxy server channels all Web traffic at a site through a single, secure port; this
enables an organization to create a secure firewall by preventing Internet access to
internal machines, while allowing Web access.
public key
In public-key cryptography , this key is made public to all. It is primarily used for
encryption but can be used for verifying signatures. See public/private key pair .
public-key cryptography
Encryption method that uses two different random numbers ( key s). See public key
and public-key encryption .
public-key encryption
The process where the sender of a message encrypts the message with the public
key of the recipient. Upon delivery, the message is decrypted by the recipient using
its private key.