A probabilistic algorithm for verifying polynomial middle product in linear time

Polynomial multiplication and its variants are a key ingredient in effective computer algebra. While verifying a polynomial product is a well known task, it was not yet clear how to do a similar approach for its middle product variant. In this short note, we present a new algorithm that provides such a verification with the same complexity and probability that for the classical polynomial multiplication. Furthermore, we extend our algorithm to verify any operations that compute only a certain chunk of the product, which is the case for instance of the well known short product operation.