A little bit of ssl protocols decription.

Playing with tikz to graw the hirarchich pki trust model, still needs a little
bit of refinement.
A little bit of a Dixon.
A little bit more of mathematical notation.

* Introducing → with an r on the top to decribe randomly chosen variables from a set;
* Replacing the sqrt() function name with isqrt(), to better distinguish the
 different versions of square roots adopted;
* Some notation errors in Wiener, fixing them.