I have an implementation for an internal API, the requirement is to implement some sort of basic authentication instead of oauth (generating a token).
Do you think there’s any difference between using just an API key vs using a client id + secret?
For what I see it’d be just like saying “using a password” vs “using a user and a password”.
The difference is that you can have multiple API keys for the same account.
The password is the “root secret” of the account. It is (mostly) unrevokable and doesn’t expire. It is a huge risk to have the password lying around. So it is better to quickly exchange the password for a less risky token, then you can wipe the password. Then all clients don’t need to store the password. The user just needs to provide it once then lower-value secrets can be used for future authentication.
I don’t fully understand what use case you’re thinking about.
An API key which expires is very hard to work with, imagine deploying an app with that kind of key, or a service/bot which uses that key.
Maybe you’re thinking about access tokens, which need to be regenerated every so often and can be generated with a refresh token.
API tokens don’t need to expire. But having them expire is a nice security benefit. It means that eventually they will be useless even if they are sitting around on an old laptop that gets thrown away.
For many use cases this works well. For example a client app can easily refresh the token from time-to-time. This can be managed with an access/refresh token system (which has the advantage that the token you are frequently sending over the wire doesn’t have refresh capabilities)