What is unique identifier (UID)? - Definition from WhatIs.com

Definition

unique identifier (UID)

Part of the Authentication glossary:

A unique identifier (UID) is a numeric or alphanumeric string that is associated with a single entity within a given system. UIDs make it possible to address that entity, so that it can be accessed and interacted with. 

Here are a few examples of UIDs: 

  • A Uniform Resource Identifier (URI) is a unique identifier that makes content addressable on the Internet by uniquely targeting items, such as text, video, images and applications.
  • A Uniform Resource Locator (URL) is a particular type of URI that targets Web pages so that when a browser requests them, they can be found and served to users.
  • A Universal Unique Identifier  (UUID) is a 128-bit number used to uniquely identify some object or entity on the Internet.
  • A global unique identifier (GUID) is a number that Microsoft programming generates to create a unique identity for an entity such as a Word document.
  • A bank identifier code  (BIC) is a unique identifier for a specific financial institution. 
  • A unique device identifier (UDID) is a 40-character string assigned to certain Apple devices including the iPhone, iPad, and iPod Touch.
  • An service set identifier (SSID) is a sequence of characters that uniquely names a wireless local area network (WLAN).
  • A national provider identifier (NPI) is a unique ten-digit identification number required by HIPAA for all health care providers in the United States.

This was last updated in December 2014
Contributor(s): Ivy Wigmore
Posted by: Margaret Rouse

Related Terms

Definitions

  • rainbow table

    - A rainbow table is a listing of all possible plaintext permutations of encrypted passwords specific to a given hash algorithm. Rainbow tables are often used by password cracking software for networ... (WhatIs.com)

  • single-factor token

    - A single-factor token is a small hardware device that produces one confirming credential for user authentication; the devices may be used in conjunction with other types of credentials for multifac... (WhatIs.com)

  • multifactor token

    - Multifactor tokens are security tokens that use more than one category of credential to confirm user authentication. The standard categories of authentication credentials are knowledge factors thi... (WhatIs.com)

Glossaries

  • Authentication

    - Terms related to authentication, including security definitions about passwords and words and phrases about proving identity.

  • Internet applications

    - This WhatIs.com glossary contains terms related to Internet applications, including definitions about Software as a Service (SaaS) delivery models and words and phrases about web sites, e-commerce ...

Ask a Question. Find an Answer.Powered by ITKnowledgeExchange.com

Ask An IT Question

Get answers from your peers on your most technical challenges

Ask Question

Tech TalkComment

Share
Comments

    Results

    Contribute to the conversation

    All fields are required. Comments will appear at the bottom of the article.