This is the story of how a handful of cryptographers 'hacked' the NSA. It's also a story of encryption backdoors, and why they never quite work out the way you want them to.
more here.......http://blog.cryptographyengineering.com/2015/03/attack-of-week-freak-or-factoring-nsa.html
and more here......https://www.freakattack.com/
more here.......http://blog.cryptographyengineering.com/2015/03/attack-of-week-freak-or-factoring-nsa.html
and more here......https://www.freakattack.com/