![]() ![]() Everything can be tresored : Any directory can be directly turned into an encrypted tresor that is securely stored in the cloud. Security and collaboration go hand in hand. Shared files are encrypted: Files shared between users are still encrypted in the cloud at any time. Any number of files and directories can be shared among any number of users. Shared files and folders can be jointly modified, synchronization is performed automatically. Only an e- mail address is required to send the invitation. Shareable: The owner can invite anyone with ease to collaborate and share files with. Your data stays as safe as if it was stored securely on your own system. No trust in the cloud storage provider is required. ![]() No entity is able to recover the data, except for the owner herself and users authorized by the owner. End-to-end Encrypted: Encryption and decryption are done on the client side. 3Ĥ CLIENT-SIDE DECRYPTION BOB ADMIN CLIENT-SIDE DECRYPTION CLIENT-SIDE ENCRYPTION CAROL CLIENT-SIDE DECRYPTION ALICE DAVE Figure 2 With Tresorit, encryption and decryption are done at the client side. Contrary to other solutions, no storage provider or network administrator, no unauthorized hacker, not even Tresorit can read your files. With Tresorit, you encrypt files on your computer and the only people able to see the content are the ones you expressly give permission to. The software allows you to share files and collaborate with your friends and colleagues with guaranteed cryptographic end-toend security, without sacrificing the ease of use and performance of unsecure cloud storage services. TRESORIT: COMPLETELY SECURE CLOUD COLLABORATION Tresorit provides a novel approach to secure cloud storage. This approach is just not flexible enough for collaborative use. The overhead with group management, invitation of new group members, and revocation of expired permissions quickly becomes a burden. As the amount of data and the number of people involved in the sharing rises, this approach becomes intractable. This works well for things like backup, but only as long as the user does not want to share her files. Without the blind trust in the cloud storage provider, the user could choose to encrypt her files one-by-one and only upload these secure files to the cloud. This trust, however, simply cannot be underpinned. In other words, the user has to trust the cloud storage provider for being honest and not revealing her private data. apply server-side encryption and the user has no control over how the encryption is done and who has access to the decryption keys. This is because these solutions 2ģ ADMIN SERVER-SIDE ENCRYPTION ALICE Figure 1 When using traditional cloud storage middleware, documents are visible in plaintext. Even though most solutions promise security for your data in the cloud, almost none of them can prevent the cloud storage provider itself peering into your data. Most of them even provide free-of-charge services for home users. OTHER SOLUTIONS ARE UNSATISFACTORY Several cloud storage middleware are available with just a couple of clicks on the Internet. Therefore, users should apply security-oriented cloud storage middleware that, on the one hand, keeps the usage of the cloud simple and fast, and, on the other hand, enforces the application of strong cryptographic algorithms and protocols in order to keep private and confidential data from being leaked. Furthermore, the quick spread of cloud storage solutions and their user-friendliness can possibly undermine the awareness of users regarding the transmission and storage of their confidential data. Users rarely have the possibility to check whether a given cloud provider satisfies these criteria. ![]() The main challenge of cloud storage nowadays is to guarantee integrity, confidentiality and control over all stored data. Considering both corporate and personal data which is often secret and sensitive in nature, one should not blindly entrust it to a cloud storage provider. Even worse, users have no means to control access to their data. Users, after uploading their files, have no control anymore about the way their data is handled and the location where it is stored. lockable, armoured cabinet THE CLOUD IS UNTRUSTED The cloud has huge potential when it comes to storing, sharing and exchanging files, but the security provided by cloud services is questionable. ![]()
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