1.题目描述选手使用Tent帐篷混沌映射加密数据由于浮点精度限制混沌序列出现短周期循环。已知密文与加密逻辑利用周期漏洞破解Flag。已知密文0x12,0x44,0x51,0x07,0x22,0x63,0x19,0x402.加密源码flag CTN{tent_xxxx} # Tent映射 def tent(x): if x 0.5: return 2 * x else: return 2 * (1 - x) x 0.314 key [] for _ in range(len(flag)): x tent(x) key.append(int(x*255)%256) cipher [ord(i)^j for i,j in zip(flag,key)] print(cipher)3.漏洞考点1. Tent映射线性程度高数字化迭代周期极短是CTN高频考点2. 固定初值、无动态扰动序列完全可预测、可复现3. 赛事常考混沌看似随机实际有限精度下完全规律可破解。4.解题思路直接复现Tent迭代逻辑生成密钥流异或解密即可无需爆破侧重代码审计与混沌迭代复现能力。5.完整EXP脚本cipher [0x12,0x44,0x51,0x07,0x22,0x63,0x19,0x40] def tent(x): if x 0.5: return 2 * x else: return 2 * (1 - x) x 0.314 key [] tmp x for _ in range(len(cipher)): tmp tent(tmp) key.append(int(tmp*255)%256) res .join([chr(a^b) for a,b in zip(cipher,key)]) print(Flag:,res)