icon for group SHA1, SHA2, SHA3 family. It is not an "official brand icon", it is only an icon for the <a class="external text" href="https://en.wikipedia.org/wiki/User:Krauss/Semantic-core_boxes">semantic-core box</a> of the group.
<a href="//commons.wikimedia.org/wiki/User:Krauss" title="User:Krauss">Krauss</a>
CC BY-SA 2.5
<span class="int-own-work" lang="en">Own work</span>, with internal adaptation (blur and cut) of the <a href="//commons.wikimedia.org/wiki/File:SHA-1.svg" title="File:SHA-1.svg">SHA-1.svg diagram</a>.