March 12, 2012, 8:15 AM — Data at rest has long been protected by technology called public key infrastructure (PKI), in which data is encrypted when it's created by a public key and only decrypted, in theory, by an authorized person holding the private key. But extending this type of data protection to the cloud can be complicated.
The migration to the cloud has introduced a new set of complex security issues for IT teams to manage due to the lack of direct control over the security of the data. Moreover, cloud providers believe that data security is a shared responsibility, where the service provider assures physical security and the subscribers must secure their servers and data. Presumably this would include a strategy for encryption and key management which requires that the keys be stored outside the cloud rather than in it.
Startup security company Porticor just released a solution that addresses the concern about data at rest in the cloud. Porticor offers a split key encryption solution where the cloud customer is the only one who knows the master key. What's more, Porticor handles all the complexity of encrypting data so the customer barely needs to think about it. The security and convenience is all in the unique implementation of key management.
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The fundamental problem of encrypting data in the cloud is where to store the keys. The customer can't store the keys on a disk in the cloud because they could be vulnerable to hackers. The customer could allow a vendor to store its keys, but that means putting trust in a third party. The customer could bring the keys back into his own data center, but that seems to defeat the purpose of outsourcing data center services to the cloud. Porticor now offers an alternative for key management that is both simple and secure.