| 摘要 |
A method for securely transporting personalized service policies from a trusted home SIP server to a un-trusted host server, through a hostile environment, such as the Internet, using identity-based encryption. A user is able to define an instance- based encryption seed for a public key to be used in encryption of SIP, or other open signaling protocol, personalized services, including defining the time and the location at which the public key is to be valid. The method consists of encrypting, in accordance with instance-based parameters, personal profile information describing the personalized service policies; retrieving the encrypted personal profile information at the un-trusted host server; and decrypting the encrypted personal profile information if the instance-based parameters are satisfied.
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