matlab code for embedding shamir secret shares in an 396x300 alpha channel randomly

i require matlab code for embedding 8 shamir's secret shares in an 396x300 alpha channel (divided into 2x4 subblocks)randomly.and seed value is required.

[Walter Roberson]

"Jimmy, we can almost purify drinkable water from sea water. But alas, the technique is incomplete! Iff only we had MATLAB code for embedding 8 shamir's secret shares in a 396x300 alpha channel (divided into 2x4 subblocks) randomly -- why, our hyper-turbulent flow analysis would be perfect!"