LFSR参数:
- 长度: 1024位
- 反馈多项式: 1 + x^5 + x^18 + x^1023 + x^1024
- 初始状态: 全0xAAAAAAAA 

滤波函数参数:
- 滤波状态大小: 16位 
- 抽头位置: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15] (规则分布)
- 滤波函数: f(x) = x_k ⊕ (x_{k-1} ∧ x_{k+1}) ⊕ (x_{k-2} ∧ x_{k+3})
- 非线性项数量: 2个 

=== Generating Challenge Data ===
First 100 output bits:
10101010101010101010101010101010101010101010101010
10101010101010101010101010101010101010101010101010

Generated keystream.txt with 5000 bits

=== Encrypted Flag ===
Encrypted flag (hex): 676c60677a6331756d646f745e6c31306a5f636162375e7474726f316f675e683261655f60726e756f645e756f61757573613031785f6d696a335e557c
