Feeds

DVD plus nano-rods equals security, density: researchers

A little light encryption

Providing a secure and efficient Helpdesk

Swinburne and Taiwanese researchers have demonstrated technology that can use a single laser beam to create 3D polarization in nanomaterials.

What’s cool about this is that they demonstrate that the polarization can be used to encrypt information – as well as expanding the storage capacity of optical media like DVDs.

As is shown in the illustration at the bottom of this story, the polarization technique – in its infancy at the moment – allows different images to be encoded in one place, showing up depending on the polarization the “read” beam uses.

Using polarization to encode information like this isn’t new: however, achieving 3D polarization using a single beam is, according to the researchers.

As the abstract in Nature states, “arbitrary three-dimensional polarization orientation of a beam hasn’t been achieved yet”.

Gold nano-rods tuned to specific wavelengths are added to the surface of the DVD, according to Swinburne’s Professor Min Gu. The rods are sensitive to the polarization of the “write-laser” – so while one polarization will align some particles in the rods, a different polarization will affect a different set of particles.

Professor Gu says the laser can be polarized “in any direction” – yielding the “arbitrary” polarization referred to in the Nature paper. This characteristic of the laser is what provides both the lift in storage density and the technique’s encryption possibilities. ®

Polarisation used as a kind of steganography

Depending on write polarization, the same area can store different images. Source: Nature

Internet Security Threat Report 2014

More from The Register

next story
MARS NEEDS WOMEN, claims NASA pseudo 'naut: They eat less
'Some might find this idea offensive' boffin admits
LOHAN crash lands on CNN
Overflies Die Welt en route to lively US news vid
Comet Siding Spring revealed as flying molehill
Hiding from this space pimple isn't going to do humanity's reputation any good
Experts brand LOHAN's squeaky-clean box
Phytosanitary treatment renders Vulture 2 crate fit for export
No sail: NASA spikes Sunjammer
'Solar sail' demonstrator project binned
Carry On Cosmonaut: Willful Child is a poor taste Star Trek parody
Cringeworthy, crude and crass jokes abound in Steven Erikson’s sci-fi debut
Origins of SEXUAL INTERCOURSE fished out of SCOTTISH LAKE
Fossil find proves it first happened 385 million years ago
Human spacecraft dodge COMET CHUNKS pelting off Mars
Odyssey orbiter yet to report, though - comet's trailing trash poses new threat
prev story

Whitepapers

Forging a new future with identity relationship management
Learn about ForgeRock's next generation IRM platform and how it is designed to empower CEOS's and enterprises to engage with consumers.
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.
Three 1TB solid state scorchers up for grabs
Big SSDs can be expensive but think big and think free because you could be the lucky winner of one of three 1TB Samsung SSD 840 EVO drives that we’re giving away worth over £300 apiece.
Reg Reader Research: SaaS based Email and Office Productivity Tools
Read this Reg reader report which provides advice and guidance for SMBs towards the use of SaaS based email and Office productivity tools.
Security for virtualized datacentres
Legacy security solutions are inefficient due to the architectural differences between physical and virtual environments.