Efficient processing and storage of data on untrusted cloud storage services

Cloud services have occupied a huge niche in today's IT world, however there are still some reasons why it is necessary to stop using remote data storage in some cases. In particular, one of such reasons is lack of confidence to cloud service provider. This article describes a way of interaction with the cloud storage where it is possible to conceal information stored in files and protect metadata of these files: size, quantity, etc. The main purpose of this paper is the implementation of such tool which can process files as easy as file-based encryption and has the same working speed.