Encrypt your content with AES-128 with a random (from /dev/random) key; write the key down as 32 hexadecimal digits. Nobody is going to break it, ever.
Don't you advocate the use of urandom, or is there a subtlety I haven't got yet?
Over the last days I've been looking into the whole "never use urandom for crypto" meme that permeates practically every Linux and general tech message board (and that I had believed for years).
And I've come away with the conclusion that not trusting AES (or another modern block cipher) to be "good enough" for the CSPRNG, but using the output for... AES (or another modern block cipher) is quite comical.