Data processing method and device

The invention relates to a data processing method and device. The method comprises the following steps: acquiring a first ciphertext data set of a first client and a second ciphertext data set of a second client; determining a secondary ciphertext data set of the first ciphertext data set and a secondary ciphertext data set of the second ciphertext data set; and determining an intersection of the secondary ciphertext data set of the first ciphertext data set and the secondary ciphertext data set of the second ciphertext data set, and generating an intersection result. According to the data processing method and device provided by the embodiments of the invention, the common user owned by the two institutions can be quickly determined under the condition that user data is not leaked. 本申请关于一种数据处理方法及装置。所述方法包括：获取第一客户端的第一密文数据集和第二客户端的第二密文数据集；确定所述第一密文数据集的二次密文数据集和所述第二密文数据集的二次密文数据集；确定所述第一密文数据集的二次密文数据集和所述第二密文数据集的二次密文数据集的交集，并生成交集结果。利用本申请各个实施例提供的数据处理方法及装置，能够在不泄露用户数据的情况下，快速确定两个机构所拥有的共同用户。