04:22 PM
Connect Directly

Prototype Encrypts Data Before Shipping It To The Cloud

'CloudCapsule' shields file contents from the OS, malware, and the cloud provider

[UPDATED with more details, 11/9/13]

Researchers at Georgia Tech have built a prototype that encrypts files before they are sent to the cloud for storage.

The so-called "CloudCapsule" system can be used with cloud storage services, such as Dropbox and Google Drive, for locking down files prior to their storage in the cloud and for accessing them without a proxy. The technology can be used for desktops, laptops, and mobile devices, but the researchers initially have built a prototype for just mobile devices -- specifically, iOS.

"We thought its greatest utility would be in the mobile space," given the explosion in BYOD, says Paul Royal, associate director of the Georgia Tech Information Security Center (GTISC), where the prototype was created. "This lets us combine the process isolation [feature] present in mobile OSes with a seamless and transparent way of encrypting data you want to place into the cloud."

It's the classic conundrum with the cloud: balancing utility with security. According to a new report published today by GTISC, corporate information stored in the cloud is typically secured solely with what the cloud storage provider offers. And encrypting data in the cloud via private-key encryption typically makes the cloud less useful, the report says.

In the desktop scenario, CloudCapsule basically uses a virtual machine instance that lets a user from the same machine go into encrypted mode and access encrypted files stored in the cloud. The operating system and malware have no "knowledge" of the data, according to GTISC, nor can the cloud provider read the files.

The mobile version, meanwhile, uses the process isolation feature in the mobile OS, GTISC's Royal says.

"CloudCapsule is an interesting approach and from the details available ... it seems specific to DHS, which may not be ideal for other users. A potential issue that enterprises might encounter is in the deployment," says Paige Leidig, senior vice president at CipherCloud, a cloud security firm.

Leidig says CloudCapsule would be difficult to scale compared with a single gateway model -- the approach CipherCloud takes -- because it's deployed on endpoints. "The other potential problem for the endpoint approach is key management -- if the user loses the keys, they would need to be revoked and replaced, which adds more complexity, especially for large enterprises with hundreds of thousands of users," Leidig said an email interview.

But searching encrypted information remains problematic. GTISC researchers also have been working on techniques for "searchable encryption" so users can more easily find their protected data and files in the cloud. "We are trying to design types of encryption that support ... performance requirements" of real-world users, GTISC's Royal says. "Consider a person who needs to encrypt data before it goes into the cloud, but would still like to do basic keyword searches over that data. That's something we've been working on at GTISC."

Striking a balance between securing the data and indexing or searching it is complicated, he says. "There are going to be fundamental tradeoffs between security and efficiency," he says. "In some cases, there's a desire not to introduce significant overhead, so, for example, in some cases, we are turning the problem on its head and asking a person who would use this in the real world what they consider acceptable performance."

[The cyberespionage gang out of China who recently hacked into media outlet networks is now using Dropbox and WordPress in its attacks rather than via traditional email phishing attacks and server compromise. See Dropbox, WordPress Used As Cloud Cover In New APT Attacks .]

Georgia Tech researchers also have built an email encryption prototype called "Very Good Privacy," a more user-friendly option than the existing Pretty Good Privacy email encryption tool. Very Good Privacy software sits atop the user interface and supports data encryption in texting/messaging apps such as email.

The tool intercepts and encrypts the text as it's typed in, before it gets to the email service. "Plain text never gets entered into an application," Royal says. But the look and feel of the process remains unchanged for the user, so it's transparent, he says.

Royal says VGP and PGP are actually complementary: unlike PGP, VGP does not use key exchange, for example.

The full Georgia Tech Emerging Cyber Threats Report for 2014 is available here (PDF) for download.

Have a comment on this story? Please click "Add Your Comment" below. If you'd like to contact Dark Reading's editors directly, send us a message. Kelly Jackson Higgins is Executive Editor at She is an award-winning veteran technology and business journalist with more than two decades of experience in reporting and editing for various publications, including Network Computing, Secure Enterprise ... View Full Bio

Comment  | 
Print  | 
More Insights
Newest First  |  Oldest First  |  Threaded View
The Case for Integrating Physical Security & Cybersecurity
Paul Kurtz, CEO & Cofounder, TruSTAR Technology,  3/20/2018
A Look at Cybercrime's Banal Nature
Curtis Franklin Jr., Senior Editor at Dark Reading,  3/20/2018
City of Atlanta Hit with Ransomware Attack
Dark Reading Staff 3/23/2018
Register for Dark Reading Newsletters
White Papers
Current Issue
How to Cope with the IT Security Skills Shortage
Most enterprises don't have all the in-house skills they need to meet the rising threat from online attackers. Here are some tips on ways to beat the shortage.
Flash Poll
Twitter Feed
Dark Reading - Bug Report
Bug Report
Enterprise Vulnerabilities
From DHS/US-CERT's National Vulnerability Database
Published: 2017-05-09
NScript in mpengine in Microsoft Malware Protection Engine with Engine Version before 1.1.13704.0, as used in Windows Defender and other products, allows remote attackers to execute arbitrary code or cause a denial of service (type confusion and application crash) via crafted JavaScript code within ...

Published: 2017-05-08
unixsocket.c in lxterminal through 0.3.0 insecurely uses /tmp for a socket file, allowing a local user to cause a denial of service (preventing terminal launch), or possibly have other impact (bypassing terminal access control).

Published: 2017-05-08
A privilege escalation vulnerability in Brocade Fibre Channel SAN products running Brocade Fabric OS (FOS) releases earlier than v7.4.1d and v8.0.1b could allow an authenticated attacker to elevate the privileges of user accounts accessing the system via command line interface. With affected version...

Published: 2017-05-08
Improper checks for unusual or exceptional conditions in Brocade NetIron 05.8.00 and later releases up to and including 06.1.00, when the Management Module is continuously scanned on port 22, may allow attackers to cause a denial of service (crash and reload) of the management module.

Published: 2017-05-08
Nextcloud Server before 11.0.3 is vulnerable to an inadequate escaping leading to a XSS vulnerability in the search module. To be exploitable a user has to write or paste malicious content into the search dialogue.