Design Security Features Stratix IV issue (Terasic DE4 board)

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.