Wireless input device and data transmission method thereof

A data transmission method for a wireless input device, the wireless input device comprising an information receiving terminal and an information outputting terminal, wherein the information receiving terminal is a wireless receiver, and the information outputting terminal is a device body, wherein the original information is generated when the device body is operated by a user, the wireless receiver is connected with a computer host, and the computer host performs a corresponding operation according to the restored original information, and wherein the device body is a mouse body or a keyboard body, the data transmission method comprising steps of:

• (a) the information receiving terminal generating a first-portion key;
• (b) transmitting the first-portion key to the information outputting terminal;
• (c) the information outputting terminal generating a second-portion key;
• (d) converting an original information into an encrypted information according to the first-portion key, the second-portion key and an encryption algorithm;
• (e) transmitting the encrypted information and the second-portion key to the information receiving terminal;
• and
• (f) restoring the encrypted information to the original information according to the first-portion key, the second-portion key and the encryption algorithm.