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The server responds with the 401 "Unauthorized" response code, providing the authentication realm and a randomly generated, single-use value called a nonce. At this point, the browser will present the authentication realm (typically a description of the computer or system being accessed) to the user and prompt for a username and password.
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The simplest example of a challenge-response protocol is password authentication, where the challenge is asking for the password and the valid response is the correct password. An adversary who can eavesdrop on a password authentication can authenticate themselves by reusing the intercepted password. One solution is to issue multiple passwords ...
The Central Authentication Service (CAS) is a single sign-on protocol for the web. [1] Its purpose is to permit a user to access multiple applications while providing their credentials (such as user ID and password) only once. It also allows web applications to authenticate users without gaining access to a user's security credentials, such as ...
WebAuthn. Web Authentication (WebAuthn) is a web standard published by the World Wide Web Consortium (W3C). [1][2][3] WebAuthn is a core component of the FIDO2 Project under the guidance of the FIDO Alliance. [4] The goal of the project is to standardize an interface for authenticating users to web-based applications and services using public ...
In the context of a financial transaction, usually both a private "PIN code" and public user identifier are required to authenticate a user to the system. In these situations, typically the user is required to provide a non-confidential user identifier or token (the user ID ) and a confidential PIN to gain access to the system.
Claims-based identity has the potential to simplify authentication logic for individual software applications, because those applications don't have to provide mechanisms for account creation, password creation, reset, and so on.