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$$\begin{cases}
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$$\begin{cases}
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s = r - h \times a \text{ mod } q\\
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s = r - h \times a \text{ mod } q\\
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s' = r - h' \times a \text{ mod } q
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s' = r - h' \times a \text{ mod } q
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\end{cases} \iff
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\begin{cases}
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r = s + h \times a \\
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a = \frac{s' - s}{h - h'} \land h \ne h'
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\end{cases}
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\end{cases}
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$$
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$$
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therefor Alice private key $a$ is:
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$$
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a = \frac{s' - s}{h - h'}
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$$
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\section*{7}
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\section*{7}
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\subsection*{7.1}
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\subsection*{7.1}
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