&gt; The results show a 2048 bit RSA key is equivalent to around 116 &#x27;bits&#x27; of a symmetric algo. Actually, 116.884, but since, you can&#x27;t have .884 of a bit our JS implementation rounds down.<p>The number of bits is just the log base 2 of some complexity measure.  You can certainly have half of a bit in this context.