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ECB_attrack_server.py

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+from twisted.internet import reactor, protocol
+from Crypto.Cipher import AES
+
+PORT = 8005
+KEY = "@Ecb_aTTack>esew"
+SECRET = "flag{ese@qq!hooray}"
+def encrypt_block(key, plaintext):
+        encobj = AES.new(key, AES.MODE_ECB)
+        return encobj.encrypt(plaintext).encode('hex')
+def encrypt(key, ptxt):
+    if (len(ptxt) % 16 != 0):
+        ptxt = ptxt + "*" * (16 - (len(ptxt) % 16))
+    return encrypt_block(key, ptxt)
+class Server(protocol.Protocol):
+
+    def connectionMade(self):
+        msg = '''
+        Welcome to the AES_ECB Cryptography System
+        To encrypt, enter "encrypt [plaintext]". Ex, encrypt 123
+        1. cliphertext = plaintext + SECRET
+        2. this padding is *      
+        \r\n>'''
+        self.transport.write(msg)
+
+    def dataReceived(self, data):
+        try:
+            data = data.strip().split(" ")
+            print (data)
+            if data[0] == "encrypt":
+                response = encrypt(KEY,data[1] + SECRET)
+            else:
+                raise
+            self.transport.write(">" + response + "\r\n>")
+        except:
+            self.transport.write(">Something is wrong here\r\n>")
+def main():
+    factory = protocol.ServerFactory()
+    factory.protocol = Server
+    reactor.listenTCP(PORT, factory)
+    reactor.run()
+if __name__ == '__main__':
+    main()