On a sunny day (Mon, 25 Sep 2017 17:18:37 GMT) it happened Steve Wilson wrote in :
You keep moving the goal poles.
1) why use somebody else's 'random' if you are already so good at shuffling decks? In Linux you can do cat /dev/random and it will output reasonably random bytes depending on system activity (try typing something in an other terminal at the same time).2) If you are not afraid of anything then why encrypt?
3) Let's say I own the website you download the 'random data' from. Now for me it is nnnn long bit string. You take sections from it and shuffle and patch and mix. How long do you think it takes to do a bit compare to find your sections if you only changed ONE bit? Probably no longer than a few seconds. You are thinking way to much in 'characters'. I could also insert interesting sequences in it ;-) It is just silly. Refer your proposal to sci.crypt, maybe there are enough profies left there to point out potential problems.If you just wanna bee right... wrong adress.