Twitter has announced a significant increase in its data security as it moves to protect users from attacks by the "apex predators" of the Internet.

An internal team of security engineers has spent several months implementing "perfect forward secrecy," which adds an extra layer of security to the widely used https encryption deployed by banks online, by retailers and, increasingly, consumer by Web services.

Google, Facebook, Dropbox and Tumblr have all implemented forward secrecy already, and LinkedIn is understood to be introducing it in 2014.