"Vernam cipher"

   [1]Sent from Yahoo Mail on Android

   On Fri, Aug 4, 2017 at 14:17, \0xDynamite
   <dreamingforward@gmail.com> wrote:

   On 8/4/17, Randydandy <[2]randydandy@randydandy.de> wrote:
   >> Would not a coin flip with the exact same initial parameters
   (height,
   >> force, deterministic air currents, and striking surface) have the
   same
   >> result?
   >[...]
   > The problem with your algorithm is that there are no parameters that
   > would be unknown. Only if you get randomness from another source as
   > parameters which makes this pseudo random.
   Okay, I should know this, but who came up with the idea of using
   random-number generators for ciphers anyway?  Most XOR ciphers (which
   is unbreakable if, for example, you use a key as long as the text) use
   a key as a source, AFAIK.  Anyone have a reference?
   Now, chaotic functions are known mathematically to be "topologically
   complete" (I believe that's the term I learned) -- that means they
   will cover every number in the range.  An amazing feat:  consider if
   you're using  2^63 (which will fit in ONE world)  to express your real
   number in the logistic function.  Your chance of landing on a already
   visited number is 9.22^308 -- beyond the scale of indexing every atom
   in the universe.
   So, in theory you have both an UNBREAKABLE and PRACTICAL cipher
   method:  use the logistic function to make a pseudo-random number
   generator, think of unique words that you can transform into your seed
   values, and communicate those "humane" keys to your recipient.
   How can you possibly break this (apart from psychological tactics of
   guessing the words used to create the seed values)?
   Marxos

References

   1. https://overview.mail.yahoo.com/mobile/?.src=Android
   2. mailto:randydandy@randydandy.de