Multi-tenants Data Duplication Secure Storage in SaaS

In SaaS, tenants usually customize multiple duplications and put them onto different data nodes of service provider to ensure the data reliability in cloud. However un-trust service providers may tamper, delete or forge tenants´ data. On the other hands, since all the duplication look the same, the un-trusted service provider could store only one data copy rather than the required number to cheat tenants. So the tenants need to ensure that the service provider process their data duplication honestly which is not being tampered or partially deleted. This paper presents a tenant duplication integrity protection mechanisms TDIC(Tenant-oriented Duplication Integrity Checking Scheme). TDIC is tuples sample based challenge-response model and constructs new tenant duplication authentication structure (TDAS) based on tenant physical tuples. Combing TDAS with homomorphism label, TDIC allows data duplication verification without local copies. Through periodically random sampling, TDIC reduces the complexity of service provider side verification object construction and eliminate the communication consumption waste.