Abstract: The present disclosure provides a local area network architecture including a server, a client and a data transfer system. The server uses a first operating system and includes an encryption chip and a server memory storing the encrypted files. The encryption chip includes an encryption system having a different operating environment with the first operating system. The encryption system includes a file converting module and an encryption module. The file converting module converts files to a format only recognizable for the encryption system and unrecognizable for the first operating system. The encryption module encrypts the converted files. The client uses a second operating system and includes a client memory storing the files from the server and a decryption chip. The decryption chip uses a decryption system including a file reverting module and a file decryption module. The data transfer system transmits files from the server to the client.