The Associated-Data Problem
نویسنده
چکیده
When using an authenticated-encryption scheme (a shared-key mechanism that provides both privacy and authenticity) it is sometimes useful, when encrypting a message, to also authen ticate some additional information which is not privacy protected. We address this associateddata problem, wherein a Sender can bind to an authenticated ciphertext C a string AD, called its associated-data, and where the Receiver must provide the identical associated-data AD when processing C—otherwise, the ciphertext will, almost certainly, be deemed invalid. We explain the utility of this problem, give a formal definition for it, and provide efficient solutions, both in general and for the authenticated-encryption scheme OCB.
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