Technische Universität München

A photoacoustic gas sensor (100) comprises an emitter (110) configured to emit light, a sensor (120) configured to measure pressure variations and a measurement cell (130) enclosing the emitter and the sensor. At least a first ventilation opening (140a) and a second ventilation opening (140b) connect the measurement cell (130) with an environment (150).

Provided is a first network node for communicating with a second network node. The first network node includes circuitry configured to locally generate a first encryption key. The circuitry is further configured to communicate the first encryption key to the second network node via a first communication path. The circuitry is further configured to receive a second encryption key from the second network node via a second communication path. The second communication path involves at least one third network node different from a fourth network node of the first communication path. The circuitry is further configured to communicate encrypted payload data with the second network node. The encryption is based on a combination of the first and second encryption keys.

Provided is a first network node communicating in a sequence of network nodes in a network. The first network node comprises circuitry configured to generate a first cryptographic context with a second network node in the sequence. The circuitry is further configured to generate a second cryptographic context with a third network node in the sequence. With respect to the first network node, a directly neighboring network node has access to at most one of the first and the second cryptographic contexts.

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