The ISO 17799 Glossary of Information Security Terms and Phrases

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D

DATA CLASSIFICATION (Chapter 5)
This is the conscious decision to assign a level of sensitivity to data.

DATA ENCRYPTION (Chapter 10)
This is a means of 'scrambling' data so that is can only be read by those holding a 'key' (or password).

DECRYPTION (Chapter 10)
The process by which encrypted data is restored to its original form.

DENIAL OF SERVICE (DOS)
This is an internet attack against a Web site which results in, or is intended to result in, the user being denied normal service.

DES (Chapter 5)
This is the Data Encryption Standard: a data encryption standard used for the scrambling of data.

DIGITAL CERTIFICATE (Chapter 10)
This is basically the electronic version of an ID card. It establishes your 'credentials' and authenticates your connection when using the internet or a network.

DIGITAL SIGNATURE (Chapter 10)
This is an electronic equivalent of a persons signature, usually used to validates the authenticity of the sender of a message.

DMZ
Short for De-Militarised Zone, this is usually a separate part of an organisation's network, deliberately separate from the main corporate network/system in some way.

DONGLE
A device, usualyl physical, which is commonly used by developers to prevent unlicenced use of their software.