encrypting

[Mel Seder]

I have a text file that changes on a regular basis,  say once a day.

I'd like to 
   a) securely encrypt it
   b) erase original text file
   c) put encrypted file on the Internet
      wait until another change has been made
   d) download it from the Internet
   e) decrypt it
   f) edit the resulting text file
      go back to step a) and start over 

also,  is there a way to erase a text file so that it useless to anyone
trying to take a peek at it after it has been deleted?

What would you suggest?

=====
The true measure of a man is how he treats someone who can do him 
absolutely no good. -Samuel Johnson, lexicographer (1709-1784)
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