November 19, 2012, 8:02 AM — To help ease the concerns of cloud security, which Gartner says is still a chief inhibitor to enterprise public cloud adoption, buyers are looking to contracts and service-level agreements to mitigate their risks.
But Gartner cloud security analyst Jay Heiser says SLAs are still "weak" and "unsatisfying" in terms of addressing security, business continuity and assessment of security controls.
"A lot of these things are getting a lot of attention, but we're seeing little consistency in the contracts," he says, especially in the infrastructure-as-a-service (IaaS) market. Software-as-a-service (SaaS) controls are "primitive, but improving."
Below are some of the common and recommended security provisions in cloud contracts and how common and effective they are.
Customer audits on demand
These clauses allow customers to audit vendors.
Effectiveness: Partial, depending on how much the vendor allows the customer to inspect
How common? Sometimes
Data deletion certificate
Proof that data is deleted when service expires.
Effectiveness: High, legally defensible
How common? Never
Many vendors claim cloud services, by their nature, equate to disaster recovery, but that cannot always be the case. If, for example, data is only stored in a single location of a cloud provider without an offline backup, that creates a single point of failure.
Effectiveness: High, but difficult to verify. While vendors may claim they have robust systems, they are often reticent to provide evidence, citing security concerns.
How common? Not typically in contract clauses.
These provide the user credits or some sort of reimbursement in case of downtime.
Effectiveness: Partial. While a credit may be helpful, it is a post-factor remedy and does not prevent an outage from happening in the first place
How common? Often found in contracts
Effectiveness: Varies. There are multiple encryption methods. If encryption is done by the vendor when the data reaches the provider's cloud, it is less expensive and less secure compared to if the user encrypts the data before sending it to the cloud. Important factor is who stores and has access to the encryption keys. The more copies of the keys, the less secure it is. Beware of vulnerabilities related to losing keys.