Okay, I admit I haven't paid the closest attention to RPKI, but I have to ask: Is this a two-way shared-key issue, or (worse) a case where we need to rely on a central entity to be a key clearinghouse?
The reason why I mention this is obvious -- the entire PKI effort has been stalled (w.r.t. authority) because of this particular issue.
Who says there needs to be a PKI infrastructure in order to do this? There are other ways of authenticating data. For instance ARIN could hold the data that they have validated on their own servers and people could use HTTPS queries to ensure that they get the answers that they thought they would get. As for how the address owner delegates the right to announce a prefix, they could either operate their own database and ARIN would have a pointer to it, or they could register the data in ARIN's database by some secure means. There is no reason why "secure means" could not include various out of band authentication systems. People are too hung up on cryotographically secure PKI systems which are way overkill for this problem. In fact, it should be possible to design an architecture that allows for an easy upgrade to PKI if it should be determined at some future date, that PKI is necessary. --Michael Dillon