Data Dictionary - E

E

  • ECC
  • Encode
  • Encryption
  • Envelope
  • Erasable Storage
  • ESC Character
  • EXE
  • Execute

ECC
Error Correction Checksum. An ouput number that derived from a set of binary information through a set of mathematical function. This number is calculated before sending and after receiving. It allows computer or devices to verify whether the data has been corrupted during the transfer, and if possible, rectified the data based on the checksum if error detected.

Encode
In data security, to encrypt. In programming, to change into code, commonly involving changing something to a different form – for example, to change a decimal number to a binary-coded form.

Encryption
The process of making information indecipherable to protect if from unauthorized viewing or use, especially during transmission or when it is stored on a transportable magnetic medium. Encryption is usually based on a key without which the information cannot be decoded (Decrypted). The U.S. National Bureau of Standards has created an extremely complex encryption standard called DES (Data Encryption Standard) that provides virtually unlimited ways to secure a document.

Envelope
In communications, a unit of information consisting of 1 transmitted byte to which extra bits have been added for control and error checking.

  Back to Top

Erasable Storage
Storage media that can be used repeatedly because the user has the ability to obliterate whatever data was previously present. Most forms of magnetic storage, such as tape and disk, are erasable.

ESC Character
One of the 32 control codes defined in the ASC|| character set. Most commonly, it indicates the beginning of an escape sequence (a string of characters that gives instructions to as device such as a printer). It is represented internally as character code 27 (hexadecimal 1B). Escape sequences are used heavily in Hewlett-Packard’s PCL printer language, which controls the operation of its LaserJet line of laser printers.

EXE
In MS-DOS, a filename extension that indicates the file is an executable program. To run the program, the user need only type the filename (without the EXE extension) at the command prompt and press Enter.

Execute
To perform one or more instructions. In programming, execution implies loading the machine language code of the program into memory and then performing the instructions.

  Back to Top