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From: Elichai Turkel <elichai.turkel@gmail•com>
To: bitcoin-dev@lists•linuxfoundation.org
Subject: Re: [bitcoin-dev] New BIP - v2 peer-to-peer message transport protocol
Date: Sun, 16 Jun 2019 22:06:21 -0400	[thread overview]
Message-ID: <CALN7hCKheiE374S6wOMJSTufmuQFxa-d_0x_aJbEPT=KuDc0nw@mail.gmail.com> (raw)

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Hi everyone,
About the nonce being 64bit. (rfc7539 changed it to 96bit, which djb later
calls xchacha)

You suggest that we use the "message sequence number" as the nonce for
Chacha20, Is this number randomly generate or is this a counter?
And could it be reseted without rekeying?

If it is randomly generated then 64bit isn't secure enough. And we should
either move to the chacha20 from RFC7539 which has 96bit nonce and 32bit
counter or increment it manually every time.

If it's simply a counter then 64bit nonce should be fine :)

Thanks,
Elichai.

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next             reply	other threads:[~2019-06-17  2:06 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-17  2:06 Elichai Turkel [this message]
2019-06-17 16:20 ` Jonas Schnelli
2019-06-17 17:13   ` Elichai Turkel

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