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I am working on an iPhone App which communicates with a Server to store and exchange data. Since I would like to make it as simple as possible, I want to avoid registration (or mybe also the using of a password) for the user account. Is it possible (and allowed?) to get the UDID of the iPhone device and make eg. an MD5-hash of it, which I transfer to the server and use it for authentification? Since this ID is unique I could simply use it to login and get the user specified data from the server, without any need of creating login data.
Is it allowed to access the UDID, make an MD5-hash of it and store it in a database?
Second question is: how do I get the UDID? ;-)