Yes you can absolutely do this. Alpha server has a private key which Beta also knows, it uses the private key to sign an authorization ticket for Gamma. Gamma h

Yes you can absolutely do this. Alpha server has a private key which Beta also knows, it uses the private key to sign an authorization ticket for Gamma. Gamma has its own public key which it gives to Alpha when it requests access. The ticket could look like this as an example: signature = sha256(gammaskey + starttime + endttime + privatekey); request = { key: gammaskey, start: starttime, end: endtime, signature: signature }; Gamma then sends the request to Beta, Beta can verify authorization by making the signature itself and verifying it matches.