Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. A unidirectional network (also referred to as a unidirectional security gateway or data diode) is a network appliance or device allowing data to travel only in one direction, used in guaranteeing information security. They are most commonly found in high security environments such as defence, where they serve as connections between two or more networks of differing security classifications. The physical nature of unidirectional networks only allows data to pass from one side (referred to as the 'low' side) of a network connection to another (referred to as the 'high' side), and not the other way around. The benefits for the users of the high side network are that their data is kept confidential while they have access to data from the low side.Such functionality can be attractive if sensitive data is stored on a network which requires connectivity with the Internet.

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