Feeds

Quantum comms can be made even more secure

Digital signatures using quantum states

Build a business case: developing custom apps

Quantum mechanics can be used to create the “perfect” digital signature, but in practice, it's held back by the technical impossibility of retaining quantum states for more than a few seconds. Now, a group of researchers from the UK, Croatia and Greece is proposing a scheme they say would make quantum digital signatures (QDS) not just feasible, but usable.

The Achilles heel of QDS is that it depends on persistent quantum memory, they say, and this means real-world implementations wouldn't happen for years.

In a paper published in Physical Review Letters and also available at Arxiv, the researchers propose a scheme that allows the distribution of quantum digital signatures, but eliminates the need for quantum memory.

Instead, they say, their QDS works with today's linear optics.

“In a generic QDS protocol, the sender sends pairs of quantum states, quantum signatures, to the multiple recipients. The recipients store the signatures in quantum memory until the sender decides to send a particular message,” they write.

Using quantum states as the signatures ensures authenticity and nonrepudiability of the messages, but since a message might need to be verified years after its creation, current QDS schemes assume there's some way to store the signatures indefinitely – which there isn't.

“This is a serious shortcoming given that state-of-the-art quantum memories cannot achieve coherence times longer than minutes,” they write.

What the researchers propose is that the quantum states representing the signature information be converted to classical information using quantum measurements – and what the users store is the classical information representing the signature.

The researchers also note that the kinds of communication systems already used in commercial quantum key distribution (QKD) schemes could represent a practical way to implement their QDS protocol for experiments.

The paper was authored by Vedran Dunjko, Petros Wallden and Erika Andersson. ®

Endpoint data privacy in the cloud is easier than you think

More from The Register

next story
14 antivirus apps found to have security problems
Vendors just don't care, says researcher, after finding basic boo-boos in security software
'Things' on the Internet-of-things have 25 vulnerabilities apiece
Leaking sprinklers, overheated thermostats and picked locks all online
iWallet: No BONKING PLEASE, we're Apple
BLE-ding iPhones, not NFC bonkers, will drive trend - marketeers
Multipath TCP speeds up the internet so much that security breaks
Black Hat research says proposed protocol will bork network probes, flummox firewalls
Only '3% of web servers in top corps' fully fixed after Heartbleed snafu
Just slapping a patched OpenSSL on a machine ain't going to cut it, we're told
Microsoft's Euro cloud darkens: US FEDS can dig into foreign servers
They're not emails, they're business records, says court
How long is too long to wait for a security fix?
Synology finally patches OpenSSL bugs in Trevor's NAS
Israel's Iron Dome missile tech stolen by Chinese hackers
Corporate raiders Comment Crew fingered for attacks
prev story

Whitepapers

7 Elements of Radically Simple OS Migration
Avoid the typical headaches of OS migration during your next project by learning about 7 elements of radically simple OS migration.
Implementing global e-invoicing with guaranteed legal certainty
Explaining the role local tax compliance plays in successful supply chain management and e-business and how leading global brands are addressing this.
Consolidation: The Foundation for IT Business Transformation
In this whitepaper learn how effective consolidation of IT and business resources can enable multiple, meaningful business benefits.
Solving today's distributed Big Data backup challenges
Enable IT efficiency and allow a firm to access and reuse corporate information for competitive advantage, ultimately changing business outcomes.
A new approach to endpoint data protection
What is the best way to ensure comprehensive visibility, management, and control of information on both company-owned and employee-owned devices?