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  3. Differnce Between GCM and GMAC

Differnce between GCM and GMAC

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By rajeshvarma , 12 September, 2019
Forums
General discussion

Dear Sir,
As mentioned in Green book that the below are input and output of GCM

Input to GCM Block is
For Authenticated Encryption

1. Plain Text
2. Encryption Key
3. Authentcated Key
4. Nounce(IV || System Title)

Output:
1. Ciphered Text
2. Authentication Tag

What is Input and Ouput of GMAC?

I am using LN_WITH_CIPHERING application association using the HIGH_SECURITY_GMAC authentication mechanism.
In 4 Pass method ,I am able to get PASS-1 and PASS-2 but not able to generate
PaSS-3 GMAC(SC||AK||SToC)

What is input required for GMAC generation. IS it diffrent ffrom GCM ?

Regards,
Rajesh Varma

Profile picture for user Kurumi

Kurumi

6 years 9 months ago

Dear Sir,

Dear Sir,

That is received association view. Received bytes are described on Green book and content of data is described on Blue Book. You find information from the received data from those books.

BR,
Mikko

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