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3.2 Montgomery ladder点乘：运算轨迹不依赖私钥位 点乘是ECDH和ECDSA的心跳，而点乘的输入里有私钥。 最直白的double-and-add写起来三行，但它的分支（先倍点、判断后决定加不加）直接暴露私钥每一位，这在逻辑分析仪面前等于明文。