| 摘要 |
A system includes a device for generating a message; structure for selecting one of a plurality of different private keys stored within the system, each of the plurality of different private keys providing a different level of security when used in the generation of an SMPKC for the message; apparatus for associating each of a plurality of different service charges with a corresponding one of the plurality of different private keys; a device for generating an SMPKC for the message using the selected one of the plurality of different private keys; and structure for accounting for a one of the plurality of different service charges that corresponds to the selected one of the plurality of different private keys.
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