详细分析了固定故障所反映出的状态变换特征，提出状态变换故障模型以及相对应的测试生成压缩方法；
This paper describes state transition fault and collapsing of test generation basis of the character of fixed fault.
采用改进的算法针对二进制方法点乘的椭圆曲线密码进行了符号变换故障攻击，利用仿真实验进行了验证。
Using the improved algorithm, we present the attack on elliptic curve cryptosystems with binary scalar multiplication, and verify it through software simulation.
这种方法由于采用了模式变换，避免了传统行波方法中存在的受故障起始角的影响的问题。
Because the method utilizes modal transform, the problem of fault inception Angle can be avoided, which occurs in almost all conventional methods.
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