USB Key, proposed by G&D, is playing an important role in the field of network security at an unprecedented speed. This device with a smart card chip similar to the size of a key chain not only fully supports all the functions of smart cards, such as digital signature, but also combines the functions of smart cards and card readers into one. Users can realize plug-and-play security authentication service through the USB port of the computer when using it, which is very convenient. G&D Company has participated in almost all online banking projects of major domestic banks, as well as network security certification and financial settlement projects of many large enterprises. It is a leading supplier of USB Key products in China, which provides a vital security environment for future large-scale online transactions.