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We consider periodical status updates between a transmitter and a legitimatereceiver, in the presence of an eavesdropper that is sometimes able to capturepieces of information. We assume that, in the absence of such a threat, theconnection between the transmitter and the receiver is controlled by thetransmitter with the aim to minimize the age of information at the receiver'sside. However, if the presence of an eavesdropper is known, the transmitter mayfurther tune the generation rate of status updates to trade off the age ofinformation values acquired by the eavesdropper and the receiver, respectively.To analyze this problem, we first propose a metric that combines bothobjectives according to a Bergson social welfare framework, and then we solvethe problem of finding the optimal generation rate as a function of theprobability of data capture by the eavesdropper. This enables us to derivenotable and sometimes counter-intuitive conclusions, and possibly establish anextension of the age of information framework to security aspects from aperformance evaluation perspective.

It Is Rude to Ask a Sensor Its Age-of-Information: Status Updates Against an Eavesdropping Node