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Websites on other domains can submit a simple POST request to the authentication domain, which will of course include the user's cookie for that domain. … If the user is not yet authenticated - he'd be redirected to a page on the authentication domain to submit his password etc. …

Can I suggest something a little less standard, and consider going with software-based biometric authentication? …

While I agree with the other answers here in the general case, there are some regulations (e.g. PCI-DSS) that require you to prevent this. So if you fall under any of those, you dont really have …

This is known as "pass through authentication". …

A valid digital signature gives a recipient reason to believe that the message was created by a known sender, such that the sender cannot deny having sent the message (authentication and non-repudiation …

A username provides for identification, and a password allows you to verify that claimed identity (i.e. authentication). … See also Difference between authentication and identification [Crypto and Security perspective] …

Most routers use a HTTP Basic authentication scheme. To access any page, including the change password, the credentials would need to be sent in header. …

This fits somewhere between "Least Privilege" and "adaptive authentication"... …

@logicalscope raises some good suggestions, but overall you still have to deal with one cold hard fact: Technically speaking, even this Nigerian prince guy is a perfectly valid user. The …

My answer on a related question applies here too: The simple, basic concept that is missing: Identification and Authentication are not the same thing. … A username provides for identification, and a password allows you to verify that claimed identity (i.e. authentication). …

As a reminder, the typical authentication factors are: Something you know (e.g. passwords) Something you have (e.g. smartcard, or G2F) Something you are (e.g. biometrics). …

Additionally, depending on configuration, the LocalSystem application could probably authentication to other machines in the domain as the machine's computer account. …

These are not really parallel technologies, but simplistically: When you are using the SAML model, you typically respect a single issuer of SAML tokens (or perhaps a handful, but pre-defined by th …

"Throttling" and "temporary lockout" are exactly the same thing. It is likely, however, that your dev team misunderstood the concepts, and assumed you meant "throttling" like most of the other answ …

While I like a lot of the concepts mentioned by @Jacco, truth is that would be pretty much overkill in your scenario. Even RBAC is really kinda the inverse of what you need... The only model you …