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<a href="https://gitlab.com/mlichvar" style="color: #1068bf; text-decoration: none;">Miroslav Lichvar</a> created an issue: <a href="https://gitlab.com/gnutls/gnutls/-/issues/1356" style="color: #1068bf; text-decoration: none;">#1356</a>
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<a id="user-content-description-of-the-feature" class="anchor" href="#description-of-the-feature" aria-hidden="true" style="color: #1068bf; margin-top: 0; float: left; margin-left: -20px; text-decoration: none; outline: none;"></a>Description of the feature:</h2>
<p dir="auto" style="color: #303030; margin: 0 0 16px;" align="initial">AES-GCM-SIV is a nonce misuse-resistant authenticated encryption algorithm specified in
<a href="https://datatracker.ietf.org/doc/html/rfc8452" rel="nofollow noreferrer noopener" target="_blank" style="color: #1068bf; margin-top: 0; text-decoration: none;">RFC 8452</a>. When compared to AES-SIV-CMAC, which is already supported in gnutls, it is faster and uses shorter keys.</p>
<h2 dir="auto" style="font-size: 1.5em; font-weight: 600; padding-bottom: 0.3em; border-bottom-width: 1px; border-bottom-color: #eaeaea; border-bottom-style: solid; color: #303030; margin: 24px 0 16px;" align="initial">
<a id="user-content-applications-that-this-feature-may-be-relevant-to" class="anchor" href="#applications-that-this-feature-may-be-relevant-to" aria-hidden="true" style="color: #1068bf; margin-top: 0; float: left; margin-left: -20px; text-decoration: none; outline: none;"></a>Applications that this feature may be relevant to:</h2>
<p dir="auto" style="color: #303030; margin: 0 0 16px;" align="initial">The Network Time Security (NTS) protocol requires AES-SIV-CMAC, but it can negotiate a different AEAD. The length of the cookies exchanged in NTS-protected NTP packets is determined by the SIV algorithm.</p>
<p dir="auto" style="color: #303030; margin: 0 0 16px;" align="initial">There is an issue with some major ISPs that they block NTP packets longer than 200 bytes as a mitigation for some DDoS attacks exploiting the monitoring protocol of ntpd. If the servers and clients supported AES-GCM-SIV, the typical NTS-protected NTP packet would be shorter than 200 bytes and would not be blocked by the ISPs, greatly improving the reliability.</p>
<h2 dir="auto" style="font-size: 1.5em; font-weight: 600; padding-bottom: 0.3em; border-bottom-width: 1px; border-bottom-color: #eaeaea; border-bottom-style: solid; color: #303030; margin: 24px 0 16px;" align="initial">
<a id="user-content-is-this-feature-implemented-in-other-libraries-and-which" class="anchor" href="#is-this-feature-implemented-in-other-libraries-and-which" aria-hidden="true" style="color: #1068bf; margin-top: 0; float: left; margin-left: -20px; text-decoration: none; outline: none;"></a>Is this feature implemented in other libraries (and which)</h2>
<p dir="auto" style="color: #303030; margin: 0;" align="initial">No widely used crypto library seems to have this implemented yet.</p>
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