1. Compression
   Systemic variation
2. Encryption

Encryption refers to the practice of encoding data so that only someone with the right key can read it. Clever code breakers can sometimes crack encrypted messages, requiring security experts to devise more complex encryption algorithms.

1. A delicious way to cook potatoes
   An encrypted value
2. A decryption key

A hash or hash value is a string of characters that represent encrypted data. You create a hash value by running data through a hashing algorithm.

1. Secure Sockets Layer
   Secret Service Logarithm
2. Systematic Security Level

SSL stands for Secure Sockets Layer, a form of public key encryption.

1. Antivirus software
   Software that logs Internet activity
2. A filter for an Internet connection

A firewall acts as a filter for an Internet connection. It monitors incoming data and blocks certain data packets.

1. A server that retrieves data from host servers before sending it to a computer
   A virtual server that can behave like a mail server, Web server or FTP server
2. A waiter who never seems to be in the restaurant when your water glass is empty

Proxy servers act as middlemen for the Internet. They retrieve Web pages and send them to computers, which means the computer in question never has to deal with the server hosting the Web page directly.

1. Phishing pharm
   Botnet
2. Romero's Revenge

A botnet is a network of computers that have transformed into bots -- devices under the control of a third party.

1. Dangerous DOS open Security
   Digital Default of Servers
2. Distributed Denial of Service

A Distributed Denial of Service attack uses computers to send millions of message requests to a server with the goal of overwhelming and crashing the server. A large DDoS attack can affect global Internet traffic.

1. Worm
   Trojan horse
2. Computer virus

Traditionally, a computer virus is a line of code or a function within a larger computer program. While not all computer viruses are harmful, the most famous ones can cause a lot of damage.

1. A decryption method that uses complex algorithms
   A method of online identity theft
2. A way to send spam mail to millions of people at once

Phishing refers to a technique designed to fool innocent people into sharing private information like bank account numbers and credit card information.

1. Black hats
   Pirates
2. Digital rogues

A black hat hacker is someone who actively attempts to infiltrate secure systems or build computer viruses with the intent to cause mischief or steal information.