A portable device for intercepting and retransmission of infrared modulated signals

Infrared modulated signals are widely used in remote controls of common household appliances, as well as in business and public places. However, the transmission is not encrypted in any form, and can easily be intercepted and stored for future control of the appliance. This paper explains the functioning of a portable device which can intercept infrared (IR) signals and retransmit them when needed. The device was designed to include multiple functions, have a small number of buttons, and also to be portable, making it a functional keyring. As an added feature, the device can emit an infrared jamming signal, disabling any other user´s commands. Finally, we created a small, low power, reliable device that can easily duplicate infrared codes. This makes the device a portable IR security penetration tool that can take over an appliance or disable its remote control.