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Changes between Version 1 and Version 2 of Ticket #1288, comment 6

v1	v2
19	19
20	20	* EncP_R is used as the plaintext hash for goals c and d. The client can at any time ask whether a server has a share with a given EncP_R. (To do this lookup efficiently, the storage server must index shares by this as well as the SI, but that is easy if we're using a database.)
21		* the server selection index is computed as SSI = ~~Enc[K_R](CS, first segment of Plain_R, Params)~~, and included as an extra field in all cap types.
	21	* the server selection index is computed as SSI = hash(CS, first segment of Plain_R, Params), using a hash distinct from any other in the protocol, and included as an extra field in all cap types.
22	22	* before uploading, a client reserves a certain amount of space for that upload with its accounting principal credentials (e.g. using a signed message). If it did not know the file size in advance and needs more space, it can increase the reservation.
23	23	* during the upload both the client and server compute the SI. At the end, the server discards the share if it is a duplicate of one it already has; otherwise, it compares the SI it computed with the one the client tells it, and retains the share if they match.