rotor is a usable now, highly portable, NTRU based extendable output public key application. in addition, it's a collection of functions usable as a toolkit to incorporate in other applications without difficulty. designed primarily on FreeBSD and OS X. some assembly may be required.
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screen shot 2016-11-06 at 8 49 01 am

it's easier to hide something small in plain sight, isn't it?
and the body is a lot more of a digital brick without the header attached...
here's an example (click this issue, download the image):
save it in "rotor/src/testing.jpg", the name doesn't matter, really
now get yourself a good old fashioned steganography tool, jphide and seek:
go in to the "rotor/src" directory and run "jpseek testing.jpg test.enc.key"
the password is "test", since we're really just hiding that there's another file here, not the contents
that should elicit a file called "test.enc.key" which is the NTRU encrypted header that goes to "test.enc". now run "rotor --infile test.enc --dec --ext"
the password to the enclosed keypair is "t3strotor". look in the file you just decrypted, "test", it should start with "begin 644". from here, you figure out the rest. ;)
the advantage here is, without that header, you'd have a file, test.enc, that is a headerless blob of three combined ciphers - Salsa20, NTRU and then SHAKE 256. without that header, pretty hopeless even should you have the private key. and the header is small enough, i hid it in that jpg and left it on github for you in the issues. there's plenty of other ways to use that feature, this is just one.