ALL the CTFS of Crypto2025 finally

crypto-simmetric/long-secret-message/chall.py

@@ -0,0 +1,21 @@
+import os
+from Cryptodome.Cipher import ChaCha20
+
+key = os.urandom(32)
+nonce = os.urandom(12)
+print(f"Using key: {key.hex()}, nonce: {nonce.hex()}")
+
+with open("./hacker-manifesto.txt") as f:
+    lines = f.readlines()
+#
+#hacker-manifesto.txt encrypted in enc
+enc = []
+#Maybe recreating the cipher generate the same keystream?
+# Yes it is.
+
+for line in lines:
+    cipher = ChaCha20.new(key=key, nonce=nonce)
+    enc.append(cipher.encrypt(line.encode()).hex())
+
+with open("./hacker-manifesto.enc", "w") as f:
+    f.write("\n".join(enc))