Cloud storage services are becoming very popular with most companies offering 5 GB to 15 GB of free storage. Tresorit is different from other cloud storage services as it offers strong client-side security and anonymity. The company is so confident about its security that they invited hackers to break their system, which included a reward of $10,000.
The windows client of Tresorit automatically synchronizes your content when you are online. The sharing part in a bit complicated though, you have to invite users to share content and they must also have the Tresorit client installed on their system. Tresorit usually offers free users with 5 GB of free storage. It recently launched a promotion for Lifehacker readers offering 50 GB of free storage for life. The promotion is valid until May 20, 2013.
To receive your free 50 GB storage, access this link, download the Tresorit client, and register.