> Members of a hacking group linked to the Chinese government called APT 5 hijacked the NSA algorithm in 2012, according to two people involved with Juniper’s investigation and an internal document detailing its findings that Bloomberg reviewed. The hackers altered the algorithm so they could decipher encrypted data flowing through the virtual private network connections created by NetScreen devices. They returned in 2014 and added a separate backdoor that allowed them to directly access NetScreen products, according to the people and the document.

Can we have more technical details regarding this? I guess some heavy math (number theory) is involved here but really intrigued how it was developed.