Here is a question in cryptography which is probably naive, and a reference request.
Suppose I have 3 matrices(I1, I2, and I3 -same size) that I want to combine them some how(? do not know yet) to create a matrix called R. I need to find a way to be able to reconstruct R with any two of Is. Or I create an intermediate matrix T where I can use T and any of the Is to create R. I am looking for an approach that can be extended to more than 3. I thought of simple weighted addition or multiplication which are easy to crack and I am looking for other ways of doing it.