2 node [style = rounded, shape = rect] SI [label="Stego Image"]
3 node [style = "", shape = diamond] cond [label="Size of y\n enough"];
4 node [style = rounded, shape = rect] key
5 node [style = rounded, shape = rect] start end;
6 node [style = rounded, shape = rect] PI [label="Parameter\nInstantiation"]
7 node [style = rounded, shape = rect] STC [label="m = STCr(y,H)"]
8 node [style = rounded, shape = rect] ED [label="(y,H)= LSB (7 bits\nEdge Detection)"]
9 node [style = rounded, shape = rect] decrypt [label="message=decryption(m)"]
20 cond -> STC [label="Yes"]
21 cond -> PI [label="No"]