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Doubt Regarding CountC updation in Airciphering.

Praveen John Philip
Prodigy 120 points

Hi,

We are running example project of security accelerator in C6670 processor.We tried to validate Air ciphering Protocol

Ciphering Mode - AES-CTR

Authentication Mode - NULL

We have 2 queries,

1)Is CountC value initialized only once or needs to be updated for every packet manually.If initialized only once, what is the initial value?

2) Does CountC have influence over Sofware Info Word i.e. When ever Count C value changes,does sofware Info Id change?

Thank you,

Regards

Praveen John Philip