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Username

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Entersekt | Resources | Encyclopedia | Username

What is a username?

A username is a unique identifier chosen or assigned to a user for accessing a digital system, application, or online service. It is typically paired with a password or another authentication factor to verify identity. Usernames form the foundation of most authentication systems, serving as the first “something you know” or knowledge-based credential.

What are the risks of using usernames as identifiers?

While usernames are essential for distinguishing accounts, they are often predictable — based on email addresses, phone numbers, or simple naming conventions. This predictability makes usernames a weak point in the authentication process, as they can be easily guessed or harvested in data breaches. Once known, attackers only need to compromise the second credential (usually a password) to gain access.

How can usernames be made more secure?
  • Organizations can strengthen username security by:
  • Encouraging users to avoid reusing email addresses as usernames.
  • Limiting public exposure of usernames.
  • Pairing usernames with strong multi-factor authentication (MFA), like biometrics.
  • Employing risk-based authentication that evaluates login context, such as device and location.

Example

An online banking app requires a customer to log in with their username and password. Because the username is simply their email address, a fraudster who already knows their email address only needs to guess or steal their password. With added MFA (such as a push notification or a biometric challenge), the account is much harder to compromise.

Additional resources:
  • Blog: 3 Problems with password resets

Keywords:

Username | Authentication | Identity verification

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