ALL the CTFS of Crypto2025 finally

crypto-hash/equality/chall.py

@@ -0,0 +1,27 @@
+from Crypto.Hash import MD4
+import hashlib
+from binascii import unhexlify
+from secret import flag
+
+
+def md4(data: bytes) -> str:
+    h = MD4.new()
+    h.update(data)
+    return h.hexdigest()
+
+
+print("Find two strings that are both equal and different! I'll use _optimized algorithms_ to check.")
+
+s1 = unhexlify(input("Enter the first string: "))
+s2 = unhexlify(input("Enter your second string: "))
+
+md4_s1 = md4(s1)
+md4_s2 = md4(s2)
+
+md5_s1 = hashlib.md5(s1).hexdigest()
+md5_s2 = hashlib.md5(s2).hexdigest()
+
+if md4_s1 == md4_s2 and md5_s1 != md5_s2:
+    print(f"Good job! {flag}")
+else:
+    print("Try again!")