There are several schemes that can be used to achieve the diffusion property in a block cipher. Schemes include MDS code, Bit permutation, Byte/ Nibble permutation, Diffusion Matrix, Diffusion Switching Mechanism. The amount of diffusion offered by these schemes seems to be a good criteria to choose the scheme.
As reference I have "On the Diffusion Property of Iterated Functions" (see here). In that document some degree of completeness is being calculated ($D_c$) that I do not understand.
Is there any strategy to quantify how much diffusion is achieved by the above mentioned diffusion schemes?
