<blockquote>
<p>Using ECC credentials is a bit iffy currently. It works, but takes too long (>10s) to send and receive the data. Probably the same problem as <a class="issue-link js-issue-link" data-error-text="Failed to load issue title" data-id="469283310" data-permission-text="Issue title is private" data-url="https://github.com/RIOT-OS/RIOT/issues/11859" data-hovercard-type="issue" data-hovercard-url="/RIOT-OS/RIOT/issues/11859/hovercard" href="https://github.com/RIOT-OS/RIOT/issues/11859">#11859</a>.</p>
</blockquote>
<p>Not sure this helps with the problem at hand, but I wanted to point out that there is an implementation guideline for representation of elliptic curves by the light-weigh implementation guidance working group of the IETF: <a href="https://tools.ietf.org/html/draft-ietf-lwig-curve-representations-08" rel="nofollow">https://tools.ietf.org/html/draft-ietf-lwig-curve-representations-08</a></p>

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