Saturday, 20 May 2017

Frenchmen claim cure for WannaCry-infected computers





French researchers have released software tools that they claim can restore some of the computers locked up by a global cyberattack that held users' files for ransom.
The researchers said, however, that the tools are not perfect and  only if the computers infected with the WannaCry ransomware have not been rebooted after being hit. For that reason, the technique isn't likely to help many people. In addition, companies needing to restore their operations right away likely would have turned to backups, if available, by now.
The developments came Friday, the apparent deadline for owners of some  to pay a ransom of up to $600 or lose their files forever. As of Friday, the three accounts known to collect ransom payments had received less than $100,000 worth of the cybercurrency bitcoin, an amount that security researchers say is small compared with how widely WannaCry spread.
The researchers—Adrien Guinet, Matthieu Suiche and Benjamin Delpy—worked separately to find ways to decrypt files scrambled and held hostage by WannaCry.
In his research summary, Guinet—who works for the Paris-based firm Quarkslab—said his software had only been tested to work under Windows XP. He added the software helps recover the prime numbers of the RSA private key that are used by WannaCry.
After Guinet's fix came out, others looked for ways to extend that to other operating systems and have succeeded in applying the technique to the newer Windows 7 system as well.
Chris Wysopal,  with the  security company Veracode, said that after ransomware attacks, researchers will often infect one of their own machines on purpose to see if the key is somehow left in the memory. That happened here with some systems of Windows.

Wednesday, 22 March 2017

Researchers develop projection-type holographic 3-D technology 

March 23, 2017
 NICT has develop a new projection-type see-through holographic 3-D display technology combining an optical screen of a digitally designed holographic optical element(DDHOE) and a digital holographic projection technique .Holographic 3-D image reconstruction was successfully demonstrated via the see-through screen  to a target observation area .

Basically ,dynamic holographic 3-D display technology faces the severe limitation of the spatial-temporal resolution of the spatial light modulator(SLM) to realize  a practical display size and visual angle. Moreover,the general system design of holographic 3-D displays requires a large optical setup behind the display window.



In this work ,a holographic 3-D image was largely projected to a see-through screen of  DDHOE by using the digital holographic projection technique. The screen was fabricated using a hologram printer ,which was developed by NICT .the light of the enlarged holographic 3-D image was thenconcentrated to a target observation area by an appropriately designed reflection function to increase the visual angle.