Astronomy is a very interesting subject but also a very complex one. I picked this article because the author does a good job of making a complex subject simpler to understand, while keeping the topic interesting by addressing the reader with a natural and creative tone.

Summary: Cryptography specialists have developed tools to crack PPTP encryption (based on an algorithm from Microsoft), gaining access to Wi-Fi, passwords, corporate networks and data.

This website details how the Spartan scytale was used in 500 B.C. Also features a program that encodes your own message according to the spartan scytale.