| 摘要 |
A method and apparatus for a unique digital signature is provided. According to one aspect of the invention, a unique digital signature (132) comprises an adapted digital signature (144) and a service id (136). The adapted digital signature (144) provides temporary or restricted privileges for a particular electronic service. According to one embodiment only a fixed number of uses of the unique digital signature (132), corresponding to an index number (112), are allowed. In one embodiment, the electronic service is electronic message forwarding. In another embodiment, the electronic service is electronic media delivery. An authentication log file is maintained for recording status information concerning unique digital signatures.
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