diff --git a/lab8/solve.py b/lab8/solve.py
index 9ab3ee2..1383a75 100755
--- a/lab8/solve.py
+++ b/lab8/solve.py
@@ -1,11 +1,45 @@
 #!/usr/bin/env python3
 
-import angr,sys
+import angr
+import claripy
+import sys
 
 def main():
-    secret_key = b""
-    sys.stdout.buffer.write(secret_key)
+    # 1) 只載入自己編譯的 binary，不自動 load 其他動態庫
+    proj = angr.Project('./chal', load_options={'auto_load_libs': False})
 
+    # 2) 定義 8 個符號化的 8-bit 變數，對應 chal.c 中的 input[0]…input[7] :contentReference[oaicite:0]{index=0}:contentReference[oaicite:1]{index=1}
+    key_chars = [claripy.BVS(f'k{i}', 8) for i in range(8)]
+    key = claripy.Concat(*key_chars)
+
+    # 3) 模擬 fgets() 讀到換行就停，但不當 EOF
+    stdin_stream = angr.SimFileStream(
+        name='stdin',
+        content=key,
+        has_end=False
+    )
+
+    # 4) 從 main() 開始執行，stdin 掛上我們的 SimFileStream
+    state = proj.factory.entry_state(
+        args=['./chal'],
+        stdin=stdin_stream
+    )
+    # 用來避免一堆warning
+    state.options.add(angr.options.ZERO_FILL_UNCONSTRAINED_MEMORY)
+    # 5) 探索到標準輸出含 “Correct!” 的狀態即停止
+    simgr = proj.factory.simgr(state)
+    simgr.explore(
+        find = lambda s: b"Correct!" in s.posix.dumps(1),
+        avoid = lambda s: b"Wrong key!" in s.posix.dumps(1)
+    )
+    # 6) 若有找到，就把那組 key 解出來寫入 stdout（交給 chal 讀）
+    if simgr.found:
+        found = simgr.found[0]
+        solution = found.solver.eval(key, cast_to=bytes)
+        sys.stdout.buffer.write(solution)
+    else:
+        print("No solution found.", file=sys.stderr)
+        sys.exit(1)
 
 if __name__ == '__main__':
     main()