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Re: [CFRG] Can you help me with this?

Soatok Dreamseeker <soatok.dhole@gmail.com> Sat, 24 July 2021 23:00 UTC

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From: Soatok Dreamseeker <soatok.dhole@gmail.com>
Date: Sat, 24 Jul 2021 19:00:04 -0400
Message-ID: <CAOvwWh2H4kbLfJhxQNVoWkosuL88V_rbX9Pw9FJqcdzx7XhY9A@mail.gmail.com>
To: Adnan Rashid <adnanrashidpk@gmail.com>
Cc: cfrg@irtf.org
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Subject: Re: [CFRG] Can you help me with this?
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1. If you want, you can include the nonce in the AAD. In fact, this is
necessary in constructions such as CBC+HMAC to prevent attackers from
getting free reign over the first 16 bytes of the plaintext.
2. That's a very open question.
3. Check out the TLS 1.3 RFC for specifics.

Happy to continue this conversation off-list.

On Sat, Jul 24, 2021 at 11:05 AM Adnan Rashid <adnanrashidpk@gmail.com>
wrote:

> Hi Everyone,
>
>
> I am new and have few questions, My questions are regarding the AEAD.
>
>
> *Questions:*
>
>    1. A *nonce* can be (Counter. LFSR, Timestamp, A sequence number, or
>    some combination of these.) Is it possible if we can use them as
>    *aad? **aad *can also be a sequence number, written in rfc5116.
>    2. If yes then what would be a vulnerability?
>    3. How do Alice and Bob know the exact nonce for a particular packet?
>    Because packets may be dropped.
>
>
>
> Regards,
>
> ADNAN
>
> _______________________________________________
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