Blockchain

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 https://anders.com/blockchain/ with source code at github

An introduction in Danish you can find at http://www.danskbitcoinforening.dk/

Here is two guides to make and test an private blockchain

https://hackernoon.com/learn-blockchains-by-building-one-117428612f46

https://hackernoon.com/the-product-managers-guide-to-the-blockchain-part-1-fb95dfb7af31