Feeds

Boffins spy on iPhone screens from 200ft away

Shoulder surfing goes high-tech

Beginner's guide to SSL certificates

Vid North Carolina boffins have been watching text entered into iPhones from 60 meters (197ft) behind the shoulders of users – or from the front, by reading the reflections in the users' glasses.

The process uses a standard video camera. It is even possible using an iPhone's camera, though the range decreases and relies on the iPhone's habit of popping up big versions of characters typed. Once the video has been fed through the researcher's image stabilisation software, and run through some optical character recognition software and natural-language analysis, the meaning emerges, as this (silent) video demonstrates:

Apple's iPhone isn't the only smartphone to provide visual feedback by popping up an enlarged version of the character pressed, but the technique won't work with those that don't. The researchers also admit that alternative text-entry techniques, such as Swype, will confound the recognition, but those are only used by a minority.

There are some other videos showing how reflections can be read, and the accuracy possible, on the boffin's own site. Their full paper (PDF, interesting, but very mathematical in places) demonstrates that with a decent video camera they were able to collect very accurate renditions of what was typed from a considerable distance.

It seems that the biggest limitation was motion blur. Stabilisation can only work so well and as the characters pop up on the screen only for a moment, a single blur make a character impossible to read. That's easily addressed with better video equipment, and better analysis, but this research was deliberately based on standard kit.

One can imagine Jason Bourne using such a technique, and it's interesting to hear that it is possible. It might pay to think about one's surroundings when entering a password, but in reality there are already plenty of other threats to be concerned about without worrying about what people might be able to pick up reflected in your sunglasses. ®

Beginner's guide to SSL certificates

More from The Register

next story
Webcam hacker pervs in MASS HOME INVASION
You thought you were all alone? Nope – change your password, says ICO
You really need to do some tech support for Aunty Agnes
Free anti-virus software, expires, stops updating and p0wns the world
USB coding anarchy: Consider all sticks licked
Thumb drive design ruled by almighty buck
Attack reveals 81 percent of Tor users but admins call for calm
Cisco Netflow a handy tool for cheapskate attackers
Privacy bods offer GOV SPY VICTIMS a FREE SPYWARE SNIFFER
Looks for gov malware that evades most antivirus
Patch NOW! Microsoft slings emergency bug fix at Windows admins
Vulnerability promotes lusers to domain overlords ... oops
prev story

Whitepapers

Why and how to choose the right cloud vendor
The benefits of cloud-based storage in your processes. Eliminate onsite, disk-based backup and archiving in favor of cloud-based data protection.
Getting started with customer-focused identity management
Learn why identity is a fundamental requirement to digital growth, and how without it there is no way to identify and engage customers in a meaningful way.
High Performance for All
While HPC is not new, it has traditionally been seen as a specialist area – is it now geared up to meet more mainstream requirements?
Internet Security Threat Report 2014
An overview and analysis of the year in global threat activity: identify, analyze, and provide commentary on emerging trends in the dynamic threat landscape.
Storage capacity and performance optimization at Mizuno USA
Mizuno USA turn to Tegile storage technology to solve both their SAN and backup issues.