how to crack cryptography tech ?

http://www.extremetech.com/extreme/173108-researchers-crack-the-worlds-toughest-encryption-by-listening-to-the-tiny-sounds-made-by-your-computers-cpu

http://www.business-standard.com/article/companies/india-cracks-set-top-box-encryption-tech-115112800485_1.html

https://www.technologyreview.com/s/530251/how-to-break-cryptography-with-your-bare-hands/