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Tripwire

Definition: A software tool for security. Basically, it works with a database that maintains information about the byte count of files. If the byte count has changed, it will identify it to the system security manager.

Packet Filter

Definition:  Inspects each packet for user defined content, such as an IP address but does not track the state of sessions.

This is one of the least secure types of firewall.

Net Send Spam

Definition: Windows messenger vulnerability also known as net send spam, messenger spam or winpopup.

These types of ads usually take the form of a gray pop up box bearing spam (unsolicited advertisements) with an "OK" button.

Secure Sockets Layer (SSL)

Definiton: A session layer protocol that provides authentication and confidentiality to applications.

Ethernet Sniffing

Definition: This is listening with software to the Ethernet interface for packets that interest the user.

When the software sees a packet that fits certain criteria, it logs it to a file.

The most common criteria for an interesting packet is one that contains words like login or password.

DNS Spoofing

Definition: Assuming the DNS name of another system by either corrupting the name service cache of a victim system, or by compromising a domain name server for a valid domain.

Security Kernel

Definition: The hardware, firmware, and software elements of a Trusted Computing Base that implement the reference monitor concept.

It must mediate all accesses, be protected from modification, and be verifiable as correct.

Back Door

Definition: A hole in the security of a computer system deliberately left in place by designers or maintainers.

Synonymous with trap door; a hidden software or hardware mechanism used to circumvent security controls.

More information at Talking Technology with Leroy Jones, Jr.:

Zombie

Definition: A specialized type of backdoor or remote access program designed as the agent, or client (middle layer) component of a DDoS (Distributed Denial of Service) network.

Once a zombie is installed on a computer, it identifies itself to a master computer, and then waits for instructions from the master computer.

Upon receipt of instructions from the master computer, a number of zombie machines will send attack packets to a target computer.

Zombie may refer to the control program run to control one of the middle layer computers, or it may refer to a computer so controlled.

Wide Area Network (WAN)

Definition: A physical or logical network that provides capabilities for a number of independent devices to communicate with each other over a common transmission-interconnected topology in geographic areas larger than those served by local area networks.