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seen Apr 25 '12 at 3:52

Apr
25
comment Elliptic curve cryptography related key attacks
Sorry, I wasn't being clear. Quite simply, is my proposed scheme secure, and why? Ideally someone could point me to a statement that yes, creating signatures with such related keys is secure, or no it isn't.
Apr
24
comment Elliptic curve cryptography related key attacks
Actually, regarding the countermeasure at the end, it occurs to me that anything beyond $n=1$ adds no value, as you still have the problem that if you can control the last data going into the hash, you simply pick it appropriately for the result you want.