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Yes, I don't see why this scheme would not be secure. It uses a MAC over known data - protected against replay. If that data is received or calculated locally shouldn't matter. But as you already showed yourself, you bring down the security of the tag with the amount of bits required to calculate the options. So in the end you could as well just CTR-encrypt ...


There are two parts to this proposal: the use of a code book and a scheme to send short confidential and authenticated messages utilising an existing shared symmetric key. A code book can be used alone to provide a degree of confidentiality, or can be used to ascribe specific pre-agreed meanings to short messages, in combination with any scheme for sending ...

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