Biblio

Nowadays, the Internet is developed, so that the requirements for on- and offline data storage have increased. Large storage IT projects, are related to large costs and high level of business risk. A storage service provider (SSP) provides computer storage space and management. In addition to that, it offers also back-up and archiving. Despite this, many companies fears security, privacy and integrity of outsourced data. As a solution, File Assured Deletion (FADE) is a system built upon standard cryptographic issues. It aims to guarantee their privacy and integrity, and most importantly, assuredly deleted files to make them unrecoverable to anybody (including those who manage the cloud storage) upon revocations of file access policies, by encrypting outsourced data files. Unfortunately, This system remains weak, in case the key manager's security is compromised. Our work provides a new scheme that aims to improve the security of FADE by using the TPM (Trusted Platform Module) that stores safely keys, passwords and digital certificates.

Data outsourcing in cloud is emerging as a successful paradigm that benefits organizations and enterprises with high-performance, low-cost, scalable data storage and sharing services. However, this paradigm also brings forth new challenges for data confidentiality because the outsourced are not under the physic control of the data owners. The existing schemes to achieve the security and usability goal usually apply encryption to the data before outsourcing them to the storage service providers (SSP), and disclose the decryption keys only to authorized user. They cannot ensure the security of data while operating data in cloud where the third-party services are usually semi-trustworthy, and need lots of time to deal with the data. We construct a privacy data management system appending hierarchical access control called HAC-DMS, which can not only assure security but also save plenty of time when updating data in cloud.