A description of the U.S. military's first cryptographic system.

I thought this post was incredibly well written, starting with the title. The title is captivating and draws readers in by suggesting a solution to a common annoyance. The article also addresses the bigger scientific achievement: this scanner may be useful for medical purposes such as measuring glucose levels or cancer cell levels at tumor sites. The article provides sufficient, interesting information while creatively tying in witty humor. 

Mobile devices offer incredibly low security or protection from criminals trying to decipher data. 

Cryptanalysis and Frequency Analysis