The computation of a CBC-MAC from message blocks <i>m</i>1…<i>mx</i>, with secret key <i>k</i> and block cipher <i>E</i>.
Benjamin D. Esham (<a href="//commons.wikimedia.org/wiki/User:Bdesham" title="User:Bdesham">bdesham</a>)
Own work based on: <a href="//commons.wikimedia.org/wiki/File:Cbcmac.png" title="File:Cbcmac.png">Cbcmac.png</a> <i>by</i> <a href="https://en.wikipedia.org/wiki/User:PeterPearson" class="extiw" title="en:User:PeterPearson">en:User:PeterPearson</a><br>Own work  by <a href="//commons.wikimedia.org/wiki/User:Bdesham" title="User:Bdesham">bdesham</a> using:  <a href="https://en.wikipedia.org/wiki/Inkscape" class="extiw" title="w:Inkscape">Inkscape</a>.