Overview#

Identifier (ID) (Identifier strings, tokens, keys, Attribute, Identity Attributes that uniquely provides Identification of either a uniquely "Entity" or class may be an idea, physical Entity (or class thereof), or physical substance (or class thereof) context (globally or locally within a specific domain, community, directory, application, etc.

An Identifier is used to separate an Entity from the Anonymity Set

An Identifier may be a Name Form, word, number, letter, symbol, or any combination of those.

Identifiers are labels which refer to entities. They are used to keep track of what we know about those entities. [1]

Identifier Classification#

Identifier are the key used by the parties to an identification relationship to agree on the entity being represented. Identifiers may be classified as:

• Omnidirectional identifier
• Unidirectional identifier
  • Pairwise Pseudonymous Identifier (PIID)
  • Sector Identifier

UserIds and Unique Identifiers#

UserIds and Unique Identifiers as we use them are Identifier

RFC 6973 Section 3.3 #

RFC 6973 Section 3.3 defines Identifier as A data object uniquely referring to a specific identity of a protocol entity or individual in some context. See RFC 4949.

Identifiers can be based upon any Name Form Official Names, Personal Names, and/or nicknames or can be artificial (for example, x9z32vb). However, identifiers are by definition unique within their context of use, while natural names are often NOT a unique Identifier.

More Information#

There might be more information for this subject on one of the following:

• Account
• Authentication
• Bitcoin address
• Boulder
• Client_id
• DID Subject
• Decentralized Identifier
• Digital Identity
• Discovery Mechanism
• Entity
• Global Trade Item Number
• Human-palatable
• Hyperledger Indy
• I-name
• I-number
• ID
• IMessage
• Identifier
• Identifier for Advertisers
• Identifier registry
• International Standard Music Number
• Item of Interest
• Know Your Customer
• Location Area Code
• Mobile Device
• Multi-Source Identity
• NAME
• Name Service
• Object
• Omnidirectional identifier
• OpenID Connect Federation
• OpenID Provider Issuer Discovery
• Pairwise Pseudonymous Identifier
• Privacy Considerations
• Protected Health Information
• Registration
• Representational State Transfer
• Session ID
• System of Records Notice
• Unidirectional identifier
• Universal Payment Identification Code
• Variable
• Verifiable Claims
• Web Blog_blogentry_161018_1

---

• [#1] - A Primer on Functional Identity - based on information obtained 2017-10-15-