A data processing system (1) for a vehicle, comprises at least one sensor (2a, 2b, 2c), each generating sensor data; and, for each sensor (2a, 2b, 2c), a first interface (3) for outputting the generated sensor data to a serializer (4) for converting and encrypting the outputted sensor data, received from the first interface (3), into a serialized data stream which is encrypted using a specific key; a communication link (5) for transmitting the data stream between the serializer (4) and a deserializer (6) for converting and decrypting the transmitted serialized data stream using the specific key; and a second interface (7) for outputting the decrypted data stream to a data processing device (8) for processing the decrypted data stream.