eGauge Systems Tutorial 2: HomePlug information and pairing tutorial
The solution is to provide eGauge01 and HomePlug01 a separate HomePlug encryption key, such as Key01,
while eGauge02 and HomePlug02 are on another, such as Key02.
See 2.2 Changing the HomePlug encryption key to change HomePlug device’s security keys.
2.1.3 How secure is HomePlug communication?
EG301x models uses the HomePlug Green PHY specification and is compatible with HomePlug AV using
128-bit AES encryption. The EG301x and HomePlug AV adapter may be paired using push buttons located
on the devices.
eGauge2 models uses a HomePlug 1.0 link to transmit data to the installation site’s LAN. The data on this
link is encrypted with 56-bit Data Encryption Standard (DES).
By virtue of the technical limitations described previously, the reach of the HomePlug signal is usually
constrained to a single building. More specifically, most transformers will stop the HomePlug signal. For
this reason, there is little risk of a third party intercepting the communication. Furthermore, due to the nature
of how HomePlug works, even if the HomePlug signal were detectable, it would be exceptionally difficult
for a third-party device to interpret the point-to-point traffic between two other devices. Therefore, for most
owners of HomePlug devices, privacy of communication is assured without any further steps.
Even if a neighbor could pick up the HomePlug signal, any traffic other than broadcast traffic is difficult to
snoop on because the transmission-characteristics of power-lines is so poor that, in practice, communication
between any pair of devices cannot be picked up by a third device. In other words, the worst that could
happen in such a scenario is that the neighbor could pick up some broadcast traffic or could use your Internet
connection for their own purposes.
For extra security and when using HomePlug devices in an apartment or condo, where multiple residences
may be powered by a single transformer, it is possible to increase security by establishing a new encryption
key to be used for HomePlug traffic. By default, HomePlug 1.0 devices, for use with the eGauge2 are con-
figured to encrypt communication using the default password ”HomePlug”. HomePlug AV, for use with the
EG301x models, have a default encryption password ”HomePlugAV” The HomePlug page under Settings on
eGauge can be used to change the default password to a secret password. See 2.2 Changing the HomePlug
encryption key on how to change your HomePlug device’s passwords.
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