Data Reconciliation; Unique Transaction Reference Number (Utrn); Security Credentials - Landis+Gyr E470 Series User Manual

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7.6

Data reconciliation

7.7

Unique transaction reference number (UTRN)

7.8

Security credentials

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It is recommended that the energy utility regularly reconciles data read from
the meter with data expected to be present because of commands sent e.g.
meter account information and available credit.
Each Add Credit Command contains a unique transaction reference
number (UTRN). The authentication components of the UTRN acceptance
are detailed below:

If during the execution of an Add Credit Command, the UTRN in the
command has already been entered (when compared to the last 100
verified Prepayment top-up transactions (PTUT)), then a "Duplicate
UTRN entered" event is triggered and stored in the security log.

If the value of the UTRN in any Add Credit Command is greater than
the Maximum Credit Threshold, then a "UTRN exceeds Maximum
Credit Threshold" event is triggered and stored in the security log.

If the authentication of any UTRN processed as part of an Add Credit
Command fails, then a "UTRN not Authentic" event is triggered and
stored in the security log.

If during the processing of any UTRN as part of an Add Credit
command it is determined that the meter is not the intended recipient
of the UTRN, then a "UTRN not for this Device" event is triggered and
stored in the security log.
The meter uses a combination of public/private keys, certificates and
identification numbers to ensure the security of the smart meter system.
The security credentials of the meters will be produced and configured in
the meter as follows during manufacturing:
1. Landis+Gyr applies MAC and ZigBee certificates to meter.
2. Landis+Gyr initialises meter and inserts organisational certificates.
This includes all the configuration data required as part of the meter
manufacturing process.
3. Landis+Gyr generates meter private and public key pairs.
4. Landis+Gyr confirms that correct credentials are loaded onto the meter
and issues certificate signing requests (CSR) to the energy supplier.
5. Landis+Gyr issues the public certificates.
6. The energy supplier sends the CSR received to the Smart Metering
Key Infrastructure (SMKI) of DCC. The supplier will manage this step,
using DCC Pre-Installation Notification Service (GBCS CS02
command).
7. SMKI returns the approved certificates back to the energy supplier
(this could take up to 7 days).
8. The energy supplier sends the approved certificates to Landis+Gyr.
9. Landis+Gyr updates its CSR store, customises the meter and delivers
it to the supplier.
D000058620 en a – E470 Series 3 SMETS2 100 mm – ZCX310 – User Manual and Functional Description
Issue 1.2 Security aspects