This ensures a high level of confidentiality in data storage. After encryption, the files are broken up into many "puzzle pieces". These fragments are then distributed independently to different cloud storage repositories. Neither the HPI system nor the storage vendor can access the data as a whole since the key material remains exclusively at the user.
Thanks to the secure distribution of data, the HPI system meets higher demands of availability and security than would be possible with a single provider. A crucial aspect of the security of the CloudRAID system is its access to the identity management of the Bundesdruckerei (German Federal Printing Office).