| 摘要 |
The present invention provides a digital certificate (2, 32), the certificate comprising a credential attribute function (6, 38) associated with a credential attribute property (5, 36), which credential attribute function is embedded in the certificate as an executable file, in which the credential attribute function can determine the value (12, 44) of the credential attribute property at least partly by execution of the executable file. A corresponding method is also disclosed. The credential attribute property may, for example, be a credit rating which a certificate provider may wish to change over time or an access authorisation to have restricted days.
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