Review: iTwin secure file transfer, a Dropbox replacement?

Earlier this month Dropbox, a popular tool for sharing files between computers and friends, updated their Terms of Service a few times. Although the company claims they were simply trying to make the policy clearer, many people had concerns about the new wording that seemed to give Dropbox the legal right to do what they wanted with your files.

A few days later, Neowin was contacted by a company called iTwin to review their product. Their site states, “Just the two ends of a cable. No cable.” Another page states, “Carry your iTwin, not your data. Your Files, Your Storage, Your Way.

According to the company, the iTwin consists of two individual USB devices. These two halves connect together to generate a shared key that allows them to communicate with each other over the network. No data is actually stored on USB devices so, unlike a USB thumb drive, losing one does not mean you’ve lost all of your data. Intrigued, we accepted the offer.


The iTwin box is very unassuming, not much larger than a deck of cards. Inside the box are the two halves of the iTwin, a short manual, and nothing else. The iTwin currently only supports Windows XP, Windows Vista, and Windows 7, but we're told that support for Mac is currently available in Italy and will be announced worldwide in August or September.

The manual explains that the first step is to plug the connected iTwin into a USB port on your PC so that the devices can generate their shared key and to install the included software. When connected, the device is identified as a normal USB storage device. The new drive contains the iTwin software that must be installed on any PC you want to share files between.

We first decided to read through the Terms of Service to see if there was anything of interest there, and we're pleased to report that there are no statements of the company storing your data, modifying it for their own use, or anything of the sort. The tool uses several Open Source products and those packages are listed with links to the licenses.

  Package License Link
1 The GNU Transport Layer Security Library GNU LGPL v.2.1
2 UDP-Based Data Transfer BSD
3 Zlib Zlib
4 Galaxy Tool Kit CPOL
5 Bug Trap GNU LGPL v.3

Our first snag was with the installation of the software. We opened up the USB drive, double clicked on the “iTwin.exe” file, entered the Windows administrator password, and then waited for the installation process to complete. Although it looked like things were progressing, after awhile we were greeted with an error message stating that the software installation had failed. Reading closer, we determined that the software required us to be logged in as administrator and that no other users could be logged into the system. It’s not clear why this is required, but after logging off of the system, logging in as the administrator, and running the installation again, we had no problems.


Repeating the steps on a second PC, we were ready to test the iTwin’s functionality. We plugged one of the devices into one computer and the other device into the second computer. After a brief message stating that it was searching for its pair, the machines were linked up.  One machine brought up a window that showed “Local Files” and the second machine a window showing “Remote Files.” Simply drag the files and directories you want the iTwin controlling for each machine. You can, for example, drag your Documents folder into the iTwin folder so that you will always be able to access the files. For our review you can see that one machine has a “Fireworks” and “Mediterranean Vacation” folder being controlled by iTwin, while the other machine has “HP Discover,” “Internet,” “Photos,” and “iTwin.”


Anything you do in the “Remote Files” window will be automatically replicated to the iTwin’s pair. If you’re on the same subnet as the other machine, the files do not traverse the internet, allowing you to take advantage of your LAN’s speed. If you’re on a different network, then the files pass through an iTwin proxy server over port 443. In both cases your files are encrypted in transit using the encryption key stored on the iTwin devices.

One thing to keep in mind is that unlike a service such as Dropbox, files from the remote machine are never stored on the local machine. If you want to use iTwin as a backup service, you'll need to either manually copy files between the machines or setup some automation to keep the files in sync.

Along the same lines it can initially be difficult to grasp the concept of remote and local when coming from an internet based file sharing service. Since Dropbox is in the cloud you have one location to pull files from. With iTwin, you have two individual computers that can both share out different files. The local directory on computer A is equivalent to the remote directory on computer B and vice versa. This gives you a lot more flexibility but isn't entirely clear when you first starting using the tool.

Performance was good and seemed on par with a normal file transfer. A message appears in the taskbar stating what the connection speed is and whether you’re using the intranet or the Internet. We saw a window stating that files were transferring along with how much time was remaining, but the details on what files were being copied was lacking. We’d like to see a little more details here and a software update should be able to easily address this.

One thing to note is that anytime you copy a file or directory to the base “Remote Files” folder, the files will wind up on the desktop of the remote machine. This is a minor annoyance as it can create a lot of clutter on the desktop. It doesn’t appear that this is configurable so you might want to setup a separate directory to house random iTwin files that you might be copying over in addition to the other files and folders you want to share.

Currently you can only connect two computers together with the iTwin, but according to the company the functionality to add extra machines into the mix is coming via a free software update and should be available in the October timeframe.


iTwin was obviously designed with security in mind. Losing one of the devices could lead to a stranger plugging it into their machine and accessing your files, but iTwin has setup a few safeguards. First of all you can setup a password on the iTwin. When you first configure the device by connecting the two halves together and plugging it into your computer, right clicking on the iTwin icon in the system tray brings up the “Security Options,” followed by “Set iTwin Password.” Selecting this actually stores a password on the physical device. That password is required in order to even begin using the iTwin. Once it’s entered, you are logged in until you disconnect the USB device from your PC.

In addition to the password, you have the option of generating a code to remotely disable the devices. Simply type in your email address when you first setup the iTwin and you will be emailed a link. If you lose the device, you can click the link to sever the connection.

Although this remote disable is helpful, the concern is that there is no authentication involved. The email iTwin provides is a simple link meaning that if someone wanted to they could attempt to disable all iTwin devices on the planet with a simple script.

The only other thing to keep in mind is that the only time you should connect your iTwins together and plug them into your computer is when you want to reset everything. Doing so removes the password from the device, generates a new keypair, and makes your current disable code obsolete forcing you to generate a new one. Even more importantly, this will make your system forget everything that was shared between the devices. The files will still be safe on your computers but when you plug the iTwins back in, you will have to tell it what files to share between computers again.


Overall the iTwin is a great device for those who want to share files between their computers but who don’t want their files stored in the cloud where companies or governments can easily access them. The device has a one-time cost of $99 and after that you have unlimited transfers and your storage is limited to the size of your computer’s drive. It’s easy enough that non-technical users can use it and works exactly as advertised. We highly recommend the product, giving it an 8.5 out of 10.

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I'm sorry but there are far more secure cloud solutions than Dropbox to start making this a competitor... For example, Wuala. Setup Wuala on all your PCs, Macs, Linux, etc. Trade storage and you can have over a hundred gigabytes of cloud storage like me that's extremely fast, secure, and reliable. If you want, you can also pay for having that much storage per year without trading existing storage.

Plus take into consideration that it's amazing to backup with, earn storage and then reinstall your OS and download the earn the storage, you don't just trade it in and if your computer is ever off one day, boom your cloud storage decreases by doesn't, you have the same amount of storage for about a week before losing 1GB of cloud storage because your computer was off that whole week.

Wuala is also accessible too by creating secure weblinks with keys you generate or set manually. You can also get an Android app or an iPhone/iPad app.

You have options...Dropbox isn't the only cloud storage out there and it certainly isn't the best.

Wow this is just dumb. Instead of just knowing a username/password, I have to carry a USB stick for web based storage? No thanks.

mrp04 said,
Wow this is just dumb. Instead of just knowing a username/password, I have to carry a USB stick for web based storage? No thanks.

I think you're missing the point. It's NOT web based storage. It, in essence, sets up a VPN between two computers and lets you share files between the machines that way. It adds security because someone can't simply guess your username/passwrod to gain access to your files (similar to RSA tokens adding an extra layer of security). And most importantly - your files aren't sitting on some other company's computers giving them the ability to read/modify your files or waiting for a government entity to say they need to see your files. You have your files under your own control at all times - and for a lot of people, that's a huge selling point.

Sisero said,

LOL did you even read the article?

No, I thought it would be interesting, but seen the picture and asked whats the point. LOL.

Dropbox TOS:

By using our Services you provide us with information, files, and folders that you submit to Dropbox (together, “your stuff”). You retain full ownership to your stuff. We don't claim any ownership to any of it. These Terms do not grant us any rights to your stuff or intellectual property except for the limited rights that are needed to run the Services, as explained below...

So basically it like like Windows File Sharing between 2 Windows PCs, except over the network. How can this even be compared to Dropbox? Give us a real competitor please and I'll be more than happy to jump ship.

Looks like a very cool, secure replacement for Dropbox. With Dropbox's poor security and recent ToS changes smart users should be looking for options like this for file access over the internet.

It would be a replacement for Dropbox if it was anything like Dropbox. If anything this is just like file transfers over LAN with maybe a bit more security.

Wanyal said,
It would be a replacement for Dropbox if it was anything like Dropbox. If anything this is just like file transfers over LAN with maybe a bit more security.

Yeah, this is absolutely nothing like Dropbox at all. I don't even understand the comparison.

StevoFC said,

Yeah, this is absolutely nothing like Dropbox at all. I don't even understand the comparison.

+1 this product is nothing like Dropbox, i can backup on dropbox, share files over the internet if i need to on dropbox and wait, i can access dropbox from a webpage so need to install software if i dont have admin right to install software!

efjay said,
iTwin. Can an apple lawsuit be far behind?

No joke. I try to stay away from anything with "i"... but there are people out there that buy anything with "i" because they think it's Apple. Should be interesting.

njlouch said,
Or you could setup sFTP?

You could, but then you have to worry about security updates. In addition, anyone can attempt to login to your box unless you start locking it down based on IP address or something - but then you lose the flexibility of being able to read your files from a hotel, for example. This offers two factor authentication - you need the password (if you configure it that way) as well as the physical USB device (which has the key on it). It might not be for everyone, but for $99 it's a great way to share files in a very secure way.

It's easy enough that non-technical users can use it

Except that you have to login as an administrator to install the software in the first place?

Vice said,
Cons: Potential for DOS attack = LOL pretty big con there.

I'd say that the chances are fairly remote and the company could fix this pretty easily by either adding a level of authentication or simply making the key much longer, both of which would be simple software updates.