Wider adoption of cloud storage services by organizations has been hindered by security and privacy issues. A consequence of storing data on the cloud is that, by its very nature, the storage infrastructure is not owned by the same organization that owns the data.
In addition, the data of one user is stored along with that of many others. Traditional schemes for ensuring security can only protect data privacy by sacrificing convenient operations such as searching and sharing.
Now, Shu Qin Ren and his colleague Khin Mi Mi Aung at the A*STAR Data Storage Institute in Singapore have devised a scheme that would not only allow organizations to store data on the cloud without loss of privacy but also permit searching and sharing of the data1. The system is able to preserve the benefit of the cloud’s specialized low-cost storage infrastructure while overcoming its current privacy and flexibility limitations. “The scheme may potentially push forward the wider adoption of cloud storage usage for organizations,” says Ren.
The solution proposed by the researchers involves a central ‘key manager’, who specifically manages data authentication and access authorization. In their scheme, data stored on the cloud is encrypted by its owner and hence is indecipherable to anyone else — including the cloud storage provider. A secret key required to unlock the encryption is generated and kept by the owner, who also determines an access policy for other users. This policy is implemented by the key manager, who generates a second access key, which is then passed back to the owner. Next, the owner wraps the original encryption key in this second layer of protection. The key manager is then able to pass on the second ‘public’ key to authorized third parties to allow them to access the data.
Under traditional privacy schemes, the owner manages both the encryption of and access to their data. Sharing with a third party typically involves retrieval and decryption of the data by the owner and therefore some loss of privacy. Under Ren and Aung’s scheme — entitled ‘Privacy Preserved Data Sharing’ — the third party only deals with the key manager and, after authorization, receives the public key without interacting with the data’s owner, thus allowing privacy to be maintained.
“The research team is now building a secure data searching and sharing prototype to test on structured data such as in databases,” says Ren. “The next step is to support unstructured data.”
The A*STAR-affiliated researchers contributing to this research are from the Data Storage Institute
Ren, S. Q. & Aung, K. M. M. PPDS: Privacy Preserved Data Sharing scheme for cloud storage. International Journal of Advancements in Computing Technology 4, 493–499 (2012).
Stable magnetic bit of three atoms
21.09.2017 | Sonderforschungsbereich 668
Drones can almost see in the dark
20.09.2017 | Universität Zürich
Plants and algae use the enzyme Rubisco to fix carbon dioxide, removing it from the atmosphere and converting it into biomass. Algae have figured out a way to increase the efficiency of carbon fixation. They gather most of their Rubisco into a ball-shaped microcompartment called the pyrenoid, which they flood with a high local concentration of carbon dioxide. A team of scientists at Princeton University, the Carnegie Institution for Science, Stanford University and the Max Plank Institute of Biochemistry have unravelled the mysteries of how the pyrenoid is assembled. These insights can help to engineer crops that remove more carbon dioxide from the atmosphere while producing more food.
A warming planet
Our brains house extremely complex neuronal circuits, whose detailed structures are still largely unknown. This is especially true for the so-called cerebral cortex of mammals, where among other things vision, thoughts or spatial orientation are being computed. Here the rules by which nerve cells are connected to each other are only partly understood. A team of scientists around Moritz Helmstaedter at the Frankfiurt Max Planck Institute for Brain Research and Helene Schmidt (Humboldt University in Berlin) have now discovered a surprisingly precise nerve cell connectivity pattern in the part of the cerebral cortex that is responsible for orienting the individual animal or human in space.
The researchers report online in Nature (Schmidt et al., 2017. Axonal synapse sorting in medial entorhinal cortex, DOI: 10.1038/nature24005) that synapses in...
Whispering gallery mode (WGM) resonators are used to make tiny micro-lasers, sensors, switches, routers and other devices. These tiny structures rely on a...
Using ultrafast flashes of laser and x-ray radiation, scientists at the Max Planck Institute of Quantum Optics (Garching, Germany) took snapshots of the briefest electron motion inside a solid material to date. The electron motion lasted only 750 billionths of the billionth of a second before it fainted, setting a new record of human capability to capture ultrafast processes inside solids!
When x-rays shine onto solid materials or large molecules, an electron is pushed away from its original place near the nucleus of the atom, leaving a hole...
For the first time, physicists have successfully imaged spiral magnetic ordering in a multiferroic material. These materials are considered highly promising candidates for future data storage media. The researchers were able to prove their findings using unique quantum sensors that were developed at Basel University and that can analyze electromagnetic fields on the nanometer scale. The results – obtained by scientists from the University of Basel’s Department of Physics, the Swiss Nanoscience Institute, the University of Montpellier and several laboratories from University Paris-Saclay – were recently published in the journal Nature.
Multiferroics are materials that simultaneously react to electric and magnetic fields. These two properties are rarely found together, and their combined...
19.09.2017 | Event News
12.09.2017 | Event News
06.09.2017 | Event News
22.09.2017 | Life Sciences
22.09.2017 | Medical Engineering
22.09.2017 | Physics and Astronomy