Tech Briefs Magazine - March 2022 - Sensor-2

Provisioning Smart Sensors
for the IoT
T
he internet of things (IoT) is no stranger to most of us
at this point. IoT devices can be seen as belonging
either to the consumer, medical, or industrial markets.
Whether the device is a video doorbell, an insulin
pump, or an industrial sensor, the user will face two significant
challenges: 1) getting the device physically/logically connected
to the network and 2) making sure that the device has the proper
credentials to enable it to interoperate with other devices on
the same network or with the server(s) that are expected to collect
the device's data. These challenges can be largely grouped
into a process known as provisioning.
Basic Provisioning
The biggest challenge in the provisioning process is the ability
to ensure that a device and the connection to the network/server
are secure. This relies heavily on both asymmetric and symmetric
encryption techniques and the existence of digital certificates.
In the case of asymmetric encryption, there is a mathematically
related public/private keypair. If something
is encrypted with the
public key, then only the
private key can decrypt it. This is as opposed to symmetric encryption,
where the same key is used to both encrypt and decrypt the
message. Symmetric encryption requires fewer resources (e.g.,
fewer bits in the key, which results in faster encryption) to achieve
better security than with asymmetric encryption. However, symmetric
encryption requires the keys to be exchanged in some way
that can't be seen by an interloper. What is typically done is to use
the destination's public key to encrypt a premaster key, send it to
the destination and then the destination uses their private key to
decrypt the premaster key and generate the shared session key.
This is the way Diffie-Hellman key exchange enables the use of
faster and stronger symmetric encryption using a handshake that
leverages asymmetric encryption.
The first requirement for provisioning is that the IoT device has
a unique identity mechanism. This can be a part of the device
manufacturing process wherein an identity chip is part of the bill
of materials, or what many microprocessor manufacturers are
doing these days - burning a unique identity with public and private
keys into the processor at manufacture. This is
referred to as provisioning during
the supply chain.
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Sensor Technology, March 2022
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Tech Briefs Magazine - March 2022

Table of Contents for the Digital Edition of Tech Briefs Magazine - March 2022

Tech Briefs Magazine - March 2022 - Intro
Tech Briefs Magazine - March 2022 - Sponsor
Tech Briefs Magazine - March 2022 - Cov1
Tech Briefs Magazine - March 2022 - Cov2
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Tech Briefs Magazine - March 2022 - Cov3
Tech Briefs Magazine - March 2022 - Cov4
Tech Briefs Magazine - March 2022 - PIT-Cov1
Tech Briefs Magazine - March 2022 - PIT-Cov2
Tech Briefs Magazine - March 2022 - PIT-1
Tech Briefs Magazine - March 2022 - PIT-2
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Tech Briefs Magazine - March 2022 - PIT-28
Tech Briefs Magazine - March 2022 - PIT-Cov3
Tech Briefs Magazine - March 2022 - PIT-Cov4
Tech Briefs Magazine - March 2022 - Sensor-Cov1
Tech Briefs Magazine - March 2022 - Sensor-Cov2
Tech Briefs Magazine - March 2022 - Sensor-1
Tech Briefs Magazine - March 2022 - Sensor-2
Tech Briefs Magazine - March 2022 - Sensor-3
Tech Briefs Magazine - March 2022 - Sensor-4
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