A block cipher encryption method. Data is encrypted blocks at a time instead of each character (stream cipher/RC4). Block ciphers are slower than stream ciphers, as data is encrypted only when a block is full.


A stream cipher encryption method. Each plaintext symbol/ character is dynamically translated to ciphertext.

Registration Authority

That mechanism or person who, as part of a PKI, is involved in verifying and enrolling users.

RFC(Request for Comments)

An Internet document or standard that is the result of committee drafting and subsequent review by interested parties.


The encryption algorithm invented by Rivest, Shamir, and Adleman in 1976.

S/MIME(Secure Multipurpose Mail Extensions)

A standard for secure e-mail.

Service Provider

See ISP(Internet Service Provider).


Another layer of the OSI reference model. This layer sets up, coordinates, and terminates conversations, exchanges, and dialogues between the applications at each end.


Service Level Agreement.

Smart Card

Typically, a small plastic card with a microprocessor that can store information (for example, X.509v3 certificate).

SMTP(Simple Mail Transfer Protocol)

A TCP protocol used in sending and receiving e-mail, normally over TCP port 25.

SSL(Secure Sockets Layer)

Created by Netscape for managing the security of message transmissions in a network (

See also HTTPS(Secure Hypertext Transfer Protocol).


Transmission Control Protocol.


Transmission Control Protocol and Internet Protocol.


This OSI layer ensures complete data transfer and manages the end-to-end control and error checking.


A tool used by hackers as a DDoS.

Trip Wires

A mechanism or tool that detects hack attacks and alerts someone, such as an administrator, about the attack.

Trusted Network

A network that has been defined by a company as "trusted."


Uniform Resource Locator.

Internet Security(c) A Jumpstart for Systems Administrators and IT Managers
Internet Security: A Jumpstart for Systems Administrators and IT Managers
ISBN: 1555582982
EAN: 2147483647
Year: 2003
Pages: 103
Authors: Tim Speed, Juanita Ellis

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