2024数字中国创新大赛积分争夺赛WriteUp

签到

chars = [0x66, 0x6c, 0x61, 0x67, 0x7b, 0x63, 0x64, 0x65, 0x32, 0x36, 0x64, 0x36, 0x35, 0x2d, 0x61, 0x39, 0x33, 0x31,
         0x2d, 0x34, 0x34, 0x33, 0x31, 0x2d, 0x39, 0x38, 0x34, 0x63, 0x2d, 0x32, 0x66, 0x36, 0x64, 0x30, 0x38, 0x38,
         0x37, 0x63, 0x36, 0x61, 0x65, 0x7d]

for ch in chars:
    print((chr(ch)), end="")

得到：flag{cde26d65-a931-4431-984c-2f6d0887c6ae}

hash_append

提示哈希扩展攻击，看文件是关于 SM3 的。