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Outsourcing a relational database to the cloud offers several benefits,including scalability, availability, and cost-effectiveness. However, there areconcerns about the security and confidentiality of the outsourced data. Ageneral approach here would be to encrypt the data with a standardizedencryption algorithm and then store the data only encrypted in the cloud. Theproblem with this approach, however, is that with encryption, importantproperties of the data such as sorting, format or comparability, which areessential for the functioning of database queries, are lost. One solution tothis problem is the use of encryption algorithms, which also preserve theseproperties in the encrypted data, thus enabling queries to encrypted data.These algorithms range from simple algorithms like Caesar encryption to securealgorithms like mOPE. The report at hand presents a survey on common encryptiontechniques used for storing data in relation Cloud database services. Itpresents the applied methods and identifies their characteristics.

A Survey on Property-Preserving Database Encryption Techniques in the Cloud