Practically efficient multi-party sorting protocols from comparison sort algorithms

TLDR: This work proposes a simple and general approach of converting non-data-oblivious comparison sort algorithms, which include the above algorithms, into corresponding MPC protocols, and constructs an MPC sorting protocol from the well known efficient sorting algorithm, quicksort.

Abstract: Sorting is one of the most important primitives in various systems, for example, database systems, since it is often the dominant operation in the running time of an entire system Therefore, there is a long list of work on improving its efficiency It is also true in the context of secure multi-party computation (MPC), and several MPC sorting protocols have been proposed However, all existing MPC sorting protocols are based on less efficient sorting algorithms, and the resultant protocols are also inefficient This is because only a method for converting data-oblivious algorithms to corresponding MPC protocols is known, despite the fact that most efficient sorting algorithms such as quicksort and merge sort are not data-oblivious We propose a simple and general approach of converting non-data-oblivious comparison sort algorithms, which include the above algorithms, into corresponding MPC protocols We then construct an MPC sorting protocol from the well known efficient sorting algorithm, quicksort, with our approach The resultant protocol is practically efficient since it significantly improved the running time compared to existing protocols in experiments