1. (Difficult) Can you explain in class the difference between a signature with appendix and a message recovery scheme? Actually, if I understand correctly, it is just that in the latter you actually can find the message m, where in the signature with appendix it is not easy to actually recover m. Is that correct? What are more examples where a signature would be used?
2. (Reflective) The most interesting section was the Birthday Attack on Signatures. It is a very clever way to trick people, but yet very easily avoided if one is weary of the attack. I find it interesting that some many of these ideas have been discovered. It fascinates me that people have come up ways to attack seemingly secure things, such as the Birthday Attack. Hashing itself is a good idea and seems like a practical thing to use, but as the Birthday Attack shows, it will sometimes fail to be secure.
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