METHOD AND APPARATUS FOR JOINTLY PERFORMING DATA PROCESSING BY TWO PARTIES

摘要

The embodiments of the present specification provide a data privacy protection based method and apparatus for jointly performing data processing by two parties, wherein each of the two parties maintains an original matrix formed by private data. The method comprises that: one party, of which the matrix dimension is smaller, of the two parties carries out homomorphic encryption on its own matrix, and sends the encrypted matrix to the other party; the other party uses its own original matrix to carry out homomorphic summation operation on the encrypted matrix to obtain an encrypted comprehensive matrix, the encrypted comprehensive matrix being equivalent to a matrix obtained by encrypting a multiplication matrix; and then, the two parties carry out secret sharing under homomorphic encryption on the encrypted comprehensive matrix, and finally each obtains a matrix fragment, the sum of the fragments being the multiplication matrix, thereby realizing a secure matrix operation of the two parties.