Disclosed embodiments include a computer-implemented first method for providing the blinded result of a subtraction of a first split value of a first system from a second split value of the first system for a comparison. Furthermore, a computer-implemented second method is disclosed for computing a comparison of the blinded result of the subtraction provided by the first system with a result of a subtraction of a blinded first split value of a second system from a blinded second split value of the second system. Computer-implemented further methods for providing a contribution to the comparison of the split values are disclosed. The further methods involve a third system and a fourth system.