Multi-party secure division

The embodiment of the invention discloses a multi-party security division method, which relates to n parties, n is a positive integer not less than 3, and each party holds a dividend fragment and a divisor fragment. Any calculation participant can cooperate with the other n-1 parties based on the local fragment of the dividend absolute value and the local fragment of the divisor absolute value, and the local fragment of the quotient absolute value is obtained through one or more rounds of processing. And furthermore, any calculation participant can cooperate with the other n-1 parties based on the local fragment of the quotient absolute value, the local fragment identified by the dividend symbol and the local fragment identified by the divisor symbol to obtain the local fragment of the quotient. 本说明书实施例公开了一种多方安全除法，涉及n方，n为不小于3的正整数，每一方持有被除数的分片以及除数的分片。任一计算参与方可基于被除数绝对值的本地分片以及除数绝对值的本地分片，与其余n-1方协同，通过一轮或多轮处理，得到商绝对值的本地分片。进而，所述任一计算参与方可基于商绝对值的本地分片、被除数符号标识的本地分片以及除数符号标识的本地分片，与其余n-1方协同，得到商的本地分片。