I trying to use volatile Key Design Security Features on StratixIV divice on Terasic DE4 board.For this i need to encrypt my design and put it into flash on board. In Quartus it's possible to encrypt .sof file into .pof (and some other formats, but not .flash). doc: http://www.altera.com/literature/an/an556.pdf But in Terasic documents showed only tutorial for programming board with *.flash files. (In that tutorial .sof converts into .flash via "Nios II EDS command shell" command sof2flash.) way to solve: I don't know how convert and encrypt my .sof into .flash OR I don't know how programm DE4 board by encrypted in Quartus .pof file How can I solve this situation? Terasic support didn't give solution yet. Help me Engineers, you're my only hope.