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U.S.
Department of Transportation
Cloud
Computing: Key Challenges
§Data security
□Use encryption to protect against snooping during data
transit
□Use intrusion detection and prevention mechanisms
□Be aware of service provider’s security policies
§Reliability and
availability
□Perform periodic off-line data backups
□Google successfully used tapes to recover data deleted
inadvertently in a software
roll‐out in February
2011
§Data transfer
bottlenecks
□Use of private cloud physically close to the customer
can reduce the problem, although at a high cost
§Legal compliance
□Use service providers with strong security
controls
§Data consistency
□Users perceive eventual consistency as strong
consistency
□Google Apps platform; and Amazon’s S3 (Simple Storage
Service), SimpleDB and EC2
Elastic Compute Cloud) are successful implementers of eventual consistency