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Security Consideration on The Use of Random Number in Digital Signature
To keep it short, +1 to what K.G. said. Many bad things can happen: when you tie more than one thing to the same number, compromise of one can lead to compromise of the others. Considering how easy it is nowadays to get a good random or pseudorandom number, the whole notion of re-using them is not worth discussing.
|Authenticated DH, what protocols are secure?|