Abstract
Cloud backup system is proposed, which provides means for effective creation, secure storage and restore of backups inCloud. For data archiving new efficient SGBP file format is being used in the system, which is based on DEFLATE compressionalgorithm. Proposed format provides means for fast archive creation, which can contain significant amounts of data. Modernapproaches of backup archive protection are described in the paper. Also the SGBP format is compared to heavily used ZIP format(both ZIP32 and ZIP64). SGBP backup archives are protected using symmetric encryption AES algorithm. Because in case of loss,distortion or leak of the encryption key backup archive will become inaccessible, there is no doubt that the SGBP encryption keys needspecial protection and management. The cryptographic keys of SGBP backups are protected using distributed cloud storage system,which is based on Shamir’s threshold secret sharing scheme. After secret sharing all individual secret shares are distributed andsaved to different cloud storage services (e.g. Dropbox, GoogleDrive, SkyDrive etc.). Modules for key share validity check and shareupdate without key reconstruction are included in the system.
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