Data diodes provide physically guaranteed one-way communications in computer networks. Data diodes can be built using commercial off the shelf components, such as by disconnecting the receive end of a fiber transceiver. Several dedicated appliances are also available. Traditionally, data diodes have been used in high security settings, such as military or industrial control systems. Data diodes might also have a place in other industries, such as health care or finance, especially to transmit logs, analytics, usage, or billing information.

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