How can I validate/secure/authenticate a JavaScript-based POST request?

Question

A product I\'m helping to develop will basically work like this:

• A Web publisher creates a new page on their site that includes a

Answer 1

Give people keys on a per-domain basis.

Make people include in the requests the hash the value of the [key string + request parameters]. (The hash value should be computed on the server)

When they send you the request, you, knowing the parameters and the key, can verify the validity.