PRESS-NEWS.org - Press Release Distribution
PRESS RELEASES DISTRIBUTION

Blind signatures using offline repositories

New method in data security

2015-05-13
(Press-News.org) Digital signatures are mechanisms for authenticating the validity or authorship of a certain digital message and they aim to be digital counterparts to real (or analog) signatures. The concept was introduced by Diffie and Hellman in 1976. Notice that, when certified, digital signatures have the same legal power as traditional signatures.

With the advent of quantum computation new threats to security became a near future reality and all known digital signatures schemes are vulnerable, compromising fundamental properties of signature schemes: authenticity and authorship uniqueness. In order to overcome the potential threat of quantum computation, the community started to envisage the possibility of using quantum mechanics laws to develop new protocols that are resilient against quantum adversaries.

In the paper we show how to build such a digital blind signature scheme under the assumption that we have an offline repository and using quantum information. As a future work of this application would be the possibility of creating untraceable money, an ultimate goal of cryptography.

This work was partially supported, under the PQDR (Probabilistic, Quantum and Differential Reasoning) and Capri initiatives of SQIG at IT, CV-Quantum initiative of SQIG and Optical Communications and Photonics groups at IT, by FCT and EU FEDER, namely via the FCT PEst-OE/EEI/LA0008/2013 and UID/EEA/50008/ 2013 projects, as well as by the European Union's Seventh Framework Programme for Research (FP7). Andre Souto also acknowledges the FCT postdoc grant SFRH/ BPD/76231/2011. Joao Ribeiro acknowledges the scholarship awarded by Fundacao Calouste Gulbenkian through the program Novos Talentos em Matematica for undergraduate students.

The paper can be found in http://www.worldscientific.com/doi/pdf/10.1142/S0219749915500161 in latest issue of the International Journal of Quantum Information (IJQI).

INFORMATION:



ELSE PRESS RELEASES FROM THIS DATE:

Nuclear modernization programs threaten to prolong the nuclear era

2015-05-13
Chicago (13 May, 2015)- In the latest issue of the Bulletin of Atomic Scientists, published by SAGE, experts from the United States, Russia, and China present global perspectives on ambitious nuclear modernization programs that the world's nuclear-armed countries have begun. In the latest edition of the Bulletin's Global Forum, Georgetown University professor Matthew Kroenig argues that: "Failure to modernize would not contribute to disarmament - but more than that, it would be irresponsible. A crippled US nuclear force would embolden enemies, frighten allies, generate ...

Physicists observe attosecond real-time restructuring of electron cloud in molecule

Physicists observe attosecond real-time restructuring of electron cloud in molecule
2015-05-13
The recombination of electron shells in molecules, taking just a few dozen attoseconds (a billionth of a billionth of a second), can now be viewed "live," thanks to a new method developed by MIPT researchers and their colleagues from Denmark, Japan and Switzerland. An article detailing the results of their study has been published in the journal Nature Communications. In recent years, scientists have learned how to study ultrafast processes taking place at the atomic and molecular levels, and research in this field is expected to yield some very important results. In ...

Fusion protein controls design of photosynthesis platform

2015-05-13
This news release is available in German. Chloroplasts are the solar cells of plants and green algae. In a process called photosynthesis, light energy is used to produce biochemical energy and the oxygen we breathe. Thus, photosynthesis is one of the most important biological processes on the planet. A central part of photosynthesis takes place in a specialized structure within chloroplasts, the thylakoid membrane system. Despite its apparent important function, until now it was not clear how this specialized internal membrane system is actually formed. In a collaborative ...

Scientists discover new molecules that kill cancer cells and protect healthy cells

2015-05-13
Amsterdam, May 13, 2015 - A new family of molecules that kill cancer cells and protect healthy cells could be used to treat a number of different cancers, including cervical, breast, ovarian and lung cancers. Research published in EBioMedicine shows that as well as targeting and killing cancer cells, the molecules generate a protective effect against toxic chemicals in healthy cells. Cells can become cancerous when their DNA is damaged. Many different things can cause DNA damage, including smoking, chemicals and radiation; understanding exactly what happens at the point ...

Where do the happiest children live?

2015-05-13
London/Zurich, May 13, 2015: Children in European countries tend to report higher levels of satisfaction with their friendships while children in African countries tend to be happier with their school lives. Children in northern European countries are particularly dissatisfied with their appearance and self-confidence. Most of the 50,000 children in the 15 countries rated their satisfaction with life as a whole (on a scale from zero to ten) positively, but the percentage of children with very high well-being (10 out of 10) varied from around 78% in Turkey and 77% in Romania ...

New test could identify resistant tuberculosis faster

2015-05-13
The time needed to genetically sequence the bacteria causing tuberculosis (Mtb) from patient samples has been reduced from weeks to days using a new technique developed by a UCL-led team. This could help health service providers to better treat disease, control transmission of this infection, and monitor outbreaks. Tuberculosis (TB) disease rates in some parts of London are as high as in Sub-Saharan Africa, and drug-resistant strains are becoming increasingly common. These require specific treatments, and if doctors know that a bug is resistant they can start therapy ...

A sobering thought: 1 billion smokers and 240 million people with alcohol use disorder, worldwide

2015-05-12
A new study published today in the journal Addiction has compiled the best, most up-to-date evidence on addictive disorders globally. It shows that almost 5% of the world's adult population (240 million people) have an alcohol use disorder and more than 20% (1 billion people) smoke tobacco. Getting good data on other drugs such as heroin and cannabis is much more difficult but for comparison the number of people injecting drugs is estimated at around 15 million worldwide. The "Global Statistics on Addictive Behaviours: 2014 Status Report" goes further in showing that ...

Dartmouth team devises use of food dye, near infrared light to aid in breast resection

2015-05-12
Roughly 1 in 4 women having breast conserving surgery (BCS) return to the surgical suite for further resection because of cancerous tissue left behind due to unclear margins. Investigators at the Optics in Medicine Lab at Dartmouth's Thayer School of Engineering and Norris Cotton Cancer Center, led by Brian W. Pogue, PhD and Keith Paulsen PhD, with first author and PhD candidate David M. McClatchy III, devised a novel approach to perform near infrared (NIR) optical measurements of resected breast tissue after the margins have had their traditional marking by the surgeon ...

Study finds repetitive brain injuries may accelerate aging, dementia risk

2015-05-12
(Boston)--Repetitive head injuries that occur during contact sports and military service may accelerate the aging process by increasing the build-up of beta-amyloid in the brain, leading to worse disease and an increased likelihood of developing dementia. In particular, boxers fared the worst among athletes and military veterans with a history of head injuries. These findings, which currently appear online in the journal Acta Neuropathologica, is the first to establish the age-dependent deposition of beta-amyloid in chronic traumatic encephalopathy (CTE), and may lead ...

Wetlands continue to reduce nitrates

Wetlands continue to reduce nitrates
2015-05-12
URBANA, Ill -- Wetlands created 20 years ago between tile-drained agricultural fields and the Embarras River were recently revisited for a new two-year University of Illinois research project. Results show an overall 62 percent nitrate removal rate and little emission of nitrous oxide, a potent greenhouse gas. "Slowing down the rate of flow of the water by intercepting it in the wetland is what helps to remove the nitrate," says Mark David, a University of Illinois biogeochemist in the College of Agricultural, Consumer and Environmental Sciences. "The vegetation that ...

LAST 30 PRESS RELEASES:

Corpse flowers are threatened by spotty recordkeeping

Riding the AI wave toward rapid, precise ocean simulations

Are lifetimes of big appliances really shrinking?

Pink skies

Monkeys are world’s best yodellers - new research

Key differences between visual- and memory-led Alzheimer’s discovered

% weight loss targets in obesity management – is this the wrong objective?

An app can change how you see yourself at work

NYC speed cameras take six months to change driver behavior, effects vary by neighborhood, new study reveals

New research shows that propaganda is on the rise in China

Even the richest Americans face shorter lifespans than their European counterparts, study finds

Novel genes linked to rare childhood diarrhea

New computer model reveals how Bronze Age Scandinavians could have crossed the sea

Novel point-of-care technology delivers accurate HIV results in minutes

Researchers reveal key brain differences to explain why Ritalin helps improve focus in some more than others

Study finds nearly five-fold increase in hospitalizations for common cause of stroke

Study reveals how alcohol abuse damages cognition

Medicinal cannabis is linked to long-term benefits in health-related quality of life

Microplastics detected in cat placentas and fetuses during early pregnancy

Ancient amphibians as big as alligators died in mass mortality event in Triassic Wyoming

Scientists uncover the first clear evidence of air sacs in the fossilized bones of alvarezsaurian dinosaurs: the "hollow bones" which help modern day birds to fly

Alcohol makes male flies sexy

TB patients globally often incur "catastrophic costs" of up to $11,329 USD, despite many countries offering free treatment, with predominant drivers of cost being hospitalization and loss of income

Study links teen girls’ screen time to sleep disruptions and depression

Scientists unveil starfish-inspired wearable tech for heart monitoring

Footprints reveal prehistoric Scottish lagoons were stomping grounds for giant Jurassic dinosaurs

AI effectively predicts dementia risk in American Indian/Alaska Native elders

First guideline on newborn screening for cystic fibrosis calls for changes in practice to improve outcomes

Existing international law can help secure peace and security in outer space, study shows

Pinning down the process of West Nile virus transmission

[Press-News.org] Blind signatures using offline repositories
New method in data security