| http://www.w3.org/ns/prov#value | - The authorization string is shown encrypted with the private key of S, but it can also be encrypted with the password of the specified SP. The authorization string must be robust enough to ensure that the merchant does not merely duplicate it a number of times and send it to SP. This can be accomplished in a number of ways, including having the data and time stamp, having an indication of the bef
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