Fantastic video explaining Diffie-Hallman key exchange alogrithm used in asymetric gyptography in a simple way.

Thanks to Khan academy for yet another lessions.

This video explain the RSA algorithme

And her you find an example where the Euler Totient function is calculated in an other way

For sysetric encryption I find this video wery good

C# help

Here i list the help pages for the syntax or functionality in c# I have problems to remember, topic I have to google again and again.

  • String formater, Standard Numeric Format Strings
  • Lambda expressions, the “( x => (int)x * (int)x, number)” principle


I have know made my first investment in Bitcoin and look forward to be millionaire in this new marked 🙂

My Bitcoin ID:


Bitcoin ID:1AGhbsKW3SAFze1HsurprkmamNoiegufTH


Blockchain is the new buzzword, and can be a major step in a higher security in the digital World.

Ethereum seem to be a easy to start place for developping and testing blockchain

Blockchain for dummies

And a illustrativ demo with source code at github

An introduction in Danish you can find at

Here is two guides to make and test an private blockchain

Depth og field

I have found this webiste, where you can get a very good understanding af depth of field in an interactively way. On this site you can calculates the camera depth of field and background blur and visually simulates it on a photo together with different types of lens blur (bokeh) for any lens, camera and distance combination.