From 96aeea84db0fc06e9e2153f4ad507a6b3c62c3ab Mon Sep 17 00:00:00 2001
From: pascal <pascal@noreply.localhost>
Date: Thu, 28 May 2026 13:53:07 +0000
Subject: [PATCH] =?UTF-8?q?T=C3=A9l=C3=A9verser=20les=20fichiers=20vers=20?=
 =?UTF-8?q?"/"?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 solve.py | 38 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)
 create mode 100644 solve.py

diff --git a/solve.py b/solve.py
new file mode 100644
index 0000000..66635a1
--- /dev/null
+++ b/solve.py
@@ -0,0 +1,38 @@
+
+class Verify:
+    def __init__(self, bits):
+        self.k = bits
+        self.n = len(bits)
+
+    def verify_all(self):
+        assert all(sum(self.k[i:i + 4]) % 2 == 1 for i in range(0, self.n, 4)), "E1"
+
+        assert all(self.k[2 * i + 2] for i in range(self.n // 4) if not (self.k[i] == self.k[4 * i])), "E2"
+
+        assert all(len(set(self.k[i:i + 3])) > 1 for i in range(self.n - 2)), "E3"
+
+        assert all(sum(self.k[i:i + 8]) == 4 for i in range(self.n - 7)), "E4"
+
+        assert all(self.k[i] ^ self.k[self.n - 1 - i] for i in range(self.n // 2)), "E5"
+
+
+for n in range(256):
+    bits = [ int(b) for b in format(n, f'08b')*(128//8) ]
+    v = Verify(bits)
+    try:
+        v.verify_all()
+
+        print("ok for", n)
+        enc = bytes.fromhex("868286f1e6f4c9e182dff7c683ffd796ed80eddfe7f186ed83c1ed8582fdedffc7f1dacf")
+        key_bytes = int(''.join(map(str, bits)), 2).to_bytes(128 // 8, 'big')
+
+        flag = ""
+        for i, c in enumerate(enc):
+            flag += chr(c^key_bytes[i % len(key_bytes)])
+        print(flag)
+        break
+    except AssertionError:
+        pass
+    except Exception as e:
+        print(e)
+        pass
\ No newline at end of file