The art of protecting information by transforming it (encrypting it) into an unreadable format, called cipher text. Only those who possess a secret key can decipher (or decrypt) the message into plain text. Encrypted messages can sometimes be broken by cryptanalysis, also called codebreaking, although modern cryptography techniques are virtually unbreakable.
As the Internet and other forms of electronic communication become more prevalent, electronic security is becoming increasingly important. Cryptography is used to protect e-mail messages, credit card information, and corporate data. One of the most popular cryptography systems used on the Internet is Pretty Good Privacybecause it’s effective and free.
Cryptography systems can be broadly classified into symmetric-key systems that use a single key that both the sender and recipient have, and public-keysystems that use two keys, a public key known to everyone and a private key that only the recipient of messages uses.
- cumulative incremental backup
The backup of all data files that have been modified since the last archival backup. Compare with differential incremental backup.
Refers to an object that is acting as a reference point. For example, the current directory is the same as the working directory or default directory. The current drive is the default mass storage device . In a spreadsheet application, the current cell is the active cell, the cell that you are manipulating at the […]
(1) A special symbol, usually a solid rectangle or a blinking underline character, that signifies where the next character will be displayed on the screen. To type in different areas of the screen, you need to move the cursor. You can do this with the arrow keys, or with a mouse if your program supports […]
- cursor control keys
Special keys on computer keyboards that move the cursor. The arrow keys, for example, move the cursor up, down, right, and left. In addition, most keyboards have End, Home, Page Up , Page Down , and Backspace keys.
- cursor position
The position of the cursor on the display screen. While in text mode, a display screen is capable of displaying a certain number of lines and a certain number of characters on each line. The cursor position is represented by the line number and the character number and signifies where the next character will be […]