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Hii Mikko,
Sorry for bother you!!!
As per the Green Book
1. when the authenticated encryption function is used, the corresponding IC is used then it is incremented
by 1.
2. when the authenticated decryption function is used, the value of the IC is verified. Verification of the IC
fails – and with this, the authenticated decryption function fails – if the value being verified is smaller
than the lowest acceptable value. If the verification is successful the lowest acceptable value is set to the
value of the IC verified plus 1.
Can please help to know what is this "lowest acceptable value" and how to determine this value,
means whether we can set as constant or it depends on past invocation counter.
BR,
AP
Hi,
Hi,
It depends on the past IC value. This value is saved to Invocation counter data object 0.0.43.1.0.255.
The client must read this value using public authentication before establishing the connection to the meter.
BR,
Mikko