But there's one thing that bothers me: The Windows client listens on TCP port 127.0.0.1:7235, at least part of the time. I'm not certain exactly what conditions cause it to stop and start listening on that port while the setting "Enable Tresorit Drive" is on; but if I turn that setting off I'll reliably see Tresorit.exe listening on that port, on my machine.
Tresorit.exe also checks (every five seconds) for signs that Tresorit domains have been hijacked, such that an attacker might be able to serve their own code from tresorit.com and gain same-origin-policy access to drive.tresorit.com. I'm not sure this is sufficient given that some browsers like to use their own "secure" DNS resolvers these days, independent from the system resolver. However, this deficiency is probably mitigated by the fact that tresorit.com is enrolled for HSTS preload.
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So overall, the impression I get is that the Tresorit Windows client was written by a competent, security-conscious team. But I'm still unsettled by the combination of a custom server running on a loopback address and the Tresorit client's insistence on binding a public domain name to loopback: Together these open up an attack surface that, to my knowledge, isn't required by any of the Tresorit features I actually use.
Why does Tresorit.exe insist on binding drive.tresorit.com to 127.0.0.1, in the hosts file if necessary? Presumably this is to support some feature in the web application via same-origin-policy, however I cannot find any feature in my individual "Premium" trial plan that would appear to justify this. (I'm aware of something called "DFO" in Tresorit documentation, but I've been unable to locate this in the web interface. Maybe I'm missing something?)
A TLS tunnel is then established between the client machine and the cloud to ensure complete security when uploading and downloading. Finally, this is authenticated with the user's digital signature, which mimics the remote directory structure on the client-side to prevent remote attacks.
Tresorit was founded in 2011 by Istvan Lam (CEO), Szilveszter Szebeni (CIO) and Gyorgy Szilagyi (CPO). In the coming years, Andrea Skaliczki joined as CFO, Istvan Hartung as CTO and Arno van Zren as CSO. The company officially launched its client-side encrypted cloud storage service after emerging from its stealth beta version in April 2014.
In the past year, we have shifted our focus to serve enterprise clients and have learned that 90% of them rely on Tresorit to share data with clients, partners, and auditors outside their organization. Our new email encryption service is our solution to meet this demand.
While Tresorit isn't as comprehensive or as feature-packed as some of its competitors, it does excel in its encryption protocols, and in the quality of its client software. Just make sure Tresorit has all the tools and options you're going to need before signing up.
The interface sported by the various Tresorit apps is certainly one of the strong points of the service. The apps are clean, fresh, and modern-looking, and you won't have any problems finding your way around them. The guided tour that you get when you first open up the client apps certainly helps.
We originally tested Tresorit on macOS and found most of the functionality could be controlled through the desktop client, including file activity, sharing and integrations, however the ability to also embed Tresorit into the native file manager system - Finder - was really appreciated, helping to create a seamless experience with which users are already familiar.
For our most recent test on our Windows 11 virtual machine, the client app created a virtual mounted volume, with the drive letter 'T' appropriately enough. You can then place files in your Root Tresor or upload them via the desktop client itself.
When it comes to core functionality, the client software essentially lets you sync any file or folder from your computer or mobile device to the cloud and back, under the limits set by the type of account you're using.
As an extra level of protection, Tresorit clients apply a Message Authentication Code (MAC) to the content of each file, and this code is held only by the client and with those the file is shared, but not kept by Tresorit.
The Tresorit Blog cites a well known saying in Information Security "Trust is good, validation is better." This is ironic, as the client apps aren't open source. In other words, if Tresorit made the source code for their apps publicly available the coding community could verify that client-side "end to end" encryption works in the way they say.
These occurred on a Windows 11 virtual machine running the Tresorit desktop client, with the VM connected to the internet via a VPN server. Our speed tests consistently showed an average upload speed of 70 Mbps
Our most recent tests were using a connection with an average upload speed of 70Mbps. The 22 files (625MB in total) took a little over 180 seconds to upload. This is much slower than other major cloud storage providers like Dropbox. In fairness, many factors can affect the upload speed. If files are being encrypted client-side prior to upload this will also necessarily slow things done, whilst making your data much safer.
We're pleased to be able to see the progress of individual file uploads by hovering the mouse over the 'Syncing' icon. We also were delighted with the ability to throttle bandwidth use in the client apps, in order to avoid overwhelming your web connection, which is something other services offer too.
We deleted the original folder, which caused Tresorit to throw up an error saying Path Lost, although the client didn't remove the corresponding folder from the cloud. We right clicked the cloud folder with our test files but the only option was to "permanently delete" the folder. Files that are permanently deleted can't be recovered.
We had more joy uploading a single one of our test files. The MP3 in question synced in seconds and we could choose to delete rather than permanently delete it. It's also very simple to check Show Deleted from within the client to restore a file.
The advertised end-to-end encryption and security measures are top notch. On the face of it, there's nowhere safer to put your data. As impressive as the recent independent security audit is, we still think a cloud storage provider who places such an emphasis on security should open source their client-side apps. Although this can't happen overnight, Tresorit could follow the Signal model whereby the app is open source and available for anyone to examine but the developers don't accept "pull requests" from the community. In other words, Tresorit would remain in control of exactly what goes into the software rather than it being a group effort.
Tresorit has been brought up in multiple previous discussions, but has never actually been looked at. We should probably consider it, because our current cloud storage providers are very lacking: Nextcloud is mostly only good as a self-hosted solution, and neither Proton Drive nor Cryptee have desktop sync clients.
Tresorit seems to be the most mature end-to-end encrypted cloud storage provider available. In terms of quality on both a personal and business/enterprise level, it is on par with and a serious alternative to Google Drive, Dropbox and OneDrive who do not offer E2EE, as a secure and private file storage and collaboration platform. They offer clients for all platforms and also have email addons/plugins.
A great example of this is MEGA which claims to be E2EE and has fully open source clients, yet its encryption was found out to be so weak, broken and full of holes that user data could be easily accessed and it might as well have been stored unencrypted.
A quick gander at the company website told me the service encrypts files client-side before uploading using AES, the Advanced Encryption Standard established by the U.S. National Institute of Standards and Technology. The company uses servers located in Ireland and the Netherlands, which is an important plus for those trying to stay out of the long reach of the US government. The company is headquartered in Switzerland and user data is protected under Swiss privacy laws, which offer more protection than in the US or even the EU.
Tresorit protects your data at rest with AES 256-bit encryption. It also applies this level of encryption for folder sharing, sending shared links and email attachments. Tresorit uses the TLS 1.2 channel to encrypt communications between clients and servers.
@mprom The release notes at -us/articles/215858608-Tresorit-for-Linux still have 3.5.600.797 as most current version. Unfortunately Tresorit update their blob sometimes without giving any release notes at all. Also, the client updates itself in the users home folder without new downloads on the website. Therefore it's not a good idea to install it globally in /usr or /opt or whatever. Tresorit also do not recommend to run it as root (for all the good reasons).To be honest, it's probably not a good solution to package Tresorit at all, since Tresorit themselves advise against it (cf. -us/articles/216114157-Tresorit-for-Linux-FAQ).The only things that package currently does for you isa) verify the binary according to -us/articles/216114157-Tresorit-for-Linux-FAQandb) save you from downloading it multiple times on a multi user systemandc) install a *.service file. e24fc04721
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