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[178.197.236.118]) by smtp.gmail.com with ESMTPSA id p15sm3372263wma.40.2020.03.03.03.29.24 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 03 Mar 2020 03:29:24 -0800 (PST) To: bitcoin-dev@lists.linuxfoundation.org In-Reply-To: From: Marko Autocrypt: addr=mbencun@gmail.com; keydata= xsFNBFykyRABEADKl77HiQdiSp+F01Je5IPynLe93woyfKUoEVQQFvgjfFd2ZnYB1mXtV3X6 Y2tEKCaVilw73mCfCJEu5AGGddN3mEnkDygHB70ZGOvK1KHzA9SrQRi+M/qgN0e2eDFxLOgZ Vjexa4VxNA+bRomg/eOeSq4lDWM+Sxk70aPlLUzG2U6ww7QcG3gam0/qyOKeIYqHiPnlj2MW DD03DwTE6wrim/SQODRGyFjgpBQiJoxzaTzG+uLr3GI/7wmpTd/zuk6o9ixg9n1xfqzcStoW miv5szfVsvej77LS6cb1aB1VvvjgcYEzBp3ZDafg+INU9PcePNYpoJCy4riqv6573allnN3S GLBkAmtyJJjsDDKMy9Ql5T1sQSYnQd9wFk9NPf/pW4gIeXEGi+tQ/u+9PdP5Slp67gEQqYI3 rvUl1CnKDYgcayCjcyl9c7ScstKoODsoC80Fxy20IdZsfdd5Nd0+Kf6YpR1xTDy4x12/UL+8 +DTx2wtUqjwkW3gLvzcn9Vr1fqAgdFWe85830wj5Uxbpvlb+SJbSXNXzzRAL2XwOk21qKtug DJ9sqTsiVFxjd2z8oiZ/EhqR5bePdSwrHVsTQUX77XV2WVSOm7fMtWfeoEUz0cN49LqYNK02 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Date: Tue, 3 Mar 2020 12:29:22 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.4.1 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Content-Language: en-US X-Mailman-Approved-At: Tue, 03 Mar 2020 14:38:56 +0000 Subject: Re: [bitcoin-dev] Fwd: BIP 340 updates: even pubkeys, more secure nonce generation X-BeenThere: bitcoin-dev@lists.linuxfoundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Bitcoin Protocol Discussion List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 03 Mar 2020 11:29:28 -0000 That is an interesting point. Does the same concern apply to anti nonce covert channel protocols? In those, the host would mix in a random nonce of its own. The process is still deterministic and can be checked during signing, but unless the host persists the nonce contributions it provides, one can't check how the nonce was computed for past signatures. I am unsure how desirable this property would be in practice, though. I am guessing not that desirable, but it would be good to hear other opinions. See https://lists.linuxfoundation.org/pipermail/bitcoin-dev/2020-February/017= 655.html and https://lists.linuxfoundation.org/pipermail/bitcoin-dev/2020-February/017= 663.html Best, Marko