Importance

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Abstract

Secure registration of a new application with a server system is provided. An old application has been registered with the system. A first link between the new application and the system establishes a first key and first check data is communicated from the system to the new application and passed to the old application. A second link between the old application and the system establishes a second key based on input of a credential to the old application; the first check data is communicated from the old application to the system. Enciphered second check data is communicated from the system to the old application over the second link and further encrypted by the old application using a third key. This generates doubly-enciphered check data which is passed to the new application and decrypted using the first key and a fourth key, generated at the new application based on the first check data and input of the credential to the new application.

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First Claim