>If the sequence of X’s is huge then multiple workers can be started tell them to start computing values at different points in the value chain. How? All the k

>If the sequence of X’s is huge then multiple workers can be started tell them to start computing values at different points in the value chain. How? All the keys need to be calculated sequentially which, depending on the application, can take a significant amount of time. Worse this time grows linearly with the number of cores, so massively parallel calculations with several hundreds, thousands, of cores will become increasingly inefficient.