Secret identifier for renewed subscription
First Claim
1. A method of secure device subscription, wherein a secret identifier and a public identifier are stored in a subscribing device, the subscribing device subscribes itself to a subscription authority, involving a step in which the subscribing device identifies itself with the public identifier, and a step in which the subscription authority supplies subscription information to the subscribing device, characterized in that the method has a first-time subscription protocol and a renewed subscription protocol, the subscription authority obtains a mapping of the secret identifier during execution of the first-time subscription protocol, the subscription authority subsequently stores the mapping of the secret identifier, and the subscription authority uses the stored mapping of the secret identifier during execution of the renewed subscription protocol.
1 Assignment
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Accused Products
Abstract
The invention relates to cryptographic identification in a practical, low cost environment. A secret number (a kind of hidden identity) is stored in a device that, in combination with its public identity, can be used for identification by a Certifying Authority (CA) and subsequent subscription. To enable efficient renewed subscription, the CA will store a mapping of the hidden identity.
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Citations
27 Claims
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1. A method of secure device subscription, wherein
a secret identifier and a public identifier are stored in a subscribing device, the subscribing device subscribes itself to a subscription authority, involving a step in which the subscribing device identifies itself with the public identifier, and a step in which the subscription authority supplies subscription information to the subscribing device, characterized in that the method has a first-time subscription protocol and a renewed subscription protocol, the subscription authority obtains a mapping of the secret identifier during execution of the first-time subscription protocol, the subscription authority subsequently stores the mapping of the secret identifier, and the subscription authority uses the stored mapping of the secret identifier during execution of the renewed subscription protocol.
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15. A subscription authority device for secure device subscription, characterized in that
the subscription authority device is arranged to implement a first-time subscription protocol, during which it receives a mapping of a secret identifier of a subscribing device, the subscription authority device is arranged to store the mapping of the secret identifier, the subscription authority device is further arranged to implement a renewed subscription protocol, during which it uses the stored mapping of the secret identifier.
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16. A subscribing device to participate in a network requiring subscription, characterized in that
the subscribing device is arranged to contain a public identifier and a secret identifier, the subscribing device is further arranged to implement a first-time subscription protocol, during which it transmits a mapping of the secret identifier and during which it receives subscription information, the subscribing device is further arranged to implement a renewed subscription protocol, during which it receives subscription information which requires the secret identifier for decryption.
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18. A signal for secure device subscription, characterized in that the signal carries a mapping of a secret identifier of a subscribing device.
Specification