Subscribers of Netflix‘ online DVD/Blu-ray rental service have been complaining about receiving damaged or cracked discs from the company. “Over the last two months, we’ve had probably four to six Blu-ray discs in a row arrive with small cracks at the edge of the disc that render it unplayable,” says Pete Brown, whose wife has been a Netflix subscriber for three years.
Blu-ray is structured significantly different to DVD in that DVD is comprised of two 0.6mm thick polycarbonate discs with the data recorded to a thin metal substrate in between, while Blu-ray is a single 1.1mm polycarbonate disc with the data recorded at the top, and protected by a 0.1mm coating. The Blu-ray discs circulated by Netflix may be more affected by the process than DVDs, and you have to remember Blu-ray is still a very young format.
“The coating is supposed to protect the discs but it could also be making them more brittle,” says Adrienne Downey, senior analyst at research firm Semico. “Ultimately Blu-ray is a new technology and they are still working the kinks out of it.” The problem can’t just come down to the discs however, as BlockBuster customers don’t complain about damaged Blu-ray titles as much.
For Pete Brown and his wife, the experience has been particularly bad. They added Babel to their queue and received a cracked disc. Upon receiving a replacement disc of the same movie, they checked and found that it was also damaged. To make it worse, the same thing happened the third time too. “At a point, my wife was like, maybe they are sending us same thing to us over and over again,” said Brown.
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Result for: cracks
Two researchers plan to provide details at next week’s PacSec 2008 conference in Tokyo on how Wi-Fi Protected Access (WPA) is vulnerable to attack. Of course, this does not mean that WPA is as vulnerable to compromise in the same way that Wired-Equivalent Privacy (WEP) is, far from it in fact. The weakness in WPA is being reported by Martin Beck and Erik Tews, two graduate students in Germany. The attack could make it possible to compromise certain communications in less than 15 minutes.
The researchers found the weakness in the lesser of two WPA security protocol, Temporal Key Integrity Protocol (TKIP). Attackers can use the techniques to decrypt limited communications and can recover a special integrity checksum and send up to seven custom packets to clients on the network, according to SecurityFocus.
“The new attack on WPA is not a complete key recovery attack,” Tews said in an email to SecurityFocus. “It just allows you to decrypt packets and inject packets with custom content. But there is only a single short-term key recovered during the attack.”
