Today's Tech: PRISM rears its great ugly head through new Snowden docs and consumer groups seek government Facebook block

The NSA and GCHQ are able to break the majority of the world's online encryption through a combination of partnerships with Internet companies, influencing encryption standards and "brute force" exerted via supercomputers. Top secret documents leaked to the Guardian by Edward Snowden further reveal the extent to which Internet companies work with the intelligence agencies to allow their customer's private data to be accessed by the US and UK state. Many of the supposedly secure and encrypted services used to protect private information, including email, medical records and online banking, which are marketed as secure by Internet firms, are in fact open to the agencies through backdoors that have been placed in the encryptions, to allow GCHQ and the NSA to access to the data.

Six major consumer privacy groups are asking for government intervention in light of Facebook's proposed privacy updates. In a letter to the Federal Trade Commission, the privacy advocates argue that the changes will allow the social network "to routinely use the images and names of Facebook users for commercial advertising without consent." Facebook's updated Statement of Rights and Responsibilities and Data Use Policy come packaged with a number of required revisions to the company's governing documents, following last week's $20 million "Sponsored Stories" settlement. Most notably, Facebook wants to turn users' profile pictures into an identification tool using facial-recognition technology for friends to tag users in photos.

A Trojan targeting Android devices is being spread via botnets held inside the malware of other cyber criminals, an investigation into the Obad.a Trojan has revealed. This is the first time malicious mobile viruses have been transmitted in this way, Kaspersky Lab, the firm behind the research said. The Trojan - full name Backdoor.AndroidOS.Obad.a - was predominantly found in CIS states, with Russia recording 83 per cent of attempted infections and other detections found in Ukraine, Belarus, Uzbekistan and Kazakhstan. Apart from using mobile botnets, the highly complex Trojan is also distributed by spam messages, and fake apps stores which imitated Google Play pages, replacing legitimate links with malicious ones.

Finally, after a month of teasing the Internet with a new logo every day, Yahoo has decided upon a new design it can live with. The Internet giant this week officially unveiled its new logo, which will be appearing across all Yahoo properties going forward. The new logo is simpler and more streamlined than the original, but retains the company's iconic purple colour and exclamation point. This is the company's first major logo change in 18 years, CEO Marissa Mayer, who claims to have been heavily involved in the design process, noted. "Our existing logo felt like the iconic Yahoo yodel. We wanted to preserve that and do something playful with the OO's. Our last move was to tilt the exclamation point by 9 degrees, just to add a bit of whimsy," she said.