I am a little confused by the birthday attack on signatures. I'm still not sure how that works in practice, or how one would do it. I do understand that it is probabilistic, but I'm still not completely sure how it works.
Signatures in general are very interesting. I'm surprised to see how much our public key encryption systems can be used in clever ways to produce signatures. I was also surprised to see how a small change to a document could protect the signing. I'll have to remember that trick to protecting one's self against fraudulence in an electronic document.
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