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For that purpose, are there some security implications having that salt as a fixed byte string? The key re-use is fine here, because the standard model for MACs allows the attacker to request an arbitrary (polynomially bounded) amount of authenticated messages while still not being able to forge new MACs. As a bonus, you may want to consider using ...


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This looks like a (homework) assignment as the parameters are artificially small and the method is highly unconventional as opposed to the standard "You want the attacker to do more work?" - "Just increase the work parameter!". Because of this I'll give you some hints on how to solve this. Increase the size of the salt from 12 bits to 24 bits. You ...



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