The online storage locker's co-founder told Wired that his new service Mega will be a raid-proof version of its predecessor.
Users will be able to one-click encrypt their files through the use of a "Advanced Encryption Standard algorithm", meaning data will remain protected if the platform is seized or hacked.
"If servers are lost, if the government comes into a data centre and rapes it, if someone hacks the server or steals it, it would give him nothing," he said. "Whatever is uploaded to the site, it is going to be remain closed and private without the key."
Megaupload was shut down by the US authorities earlier this year following allegations of copyright infringement and racketeering. Dotcom is currently fighting extradition to America to face these charges.
Dotcom claims that, under the new system, Mega cannot be held accountable for the content its users upload and share, but copyright holders will still have the right to take legal action to have infringing files removed.
"If they want to use that tool, they'll have to accept, prior to getting access, that they're not going to sue us or hold us accountable for the actions of our users," Dotcom added.
Mega is scheduled to launch later this year. Dotcom is also working on a music service dubbed Megabox, which will allow artists to sell and distribute their own music and receive 90% of the profits.