A San Francisco-based security company will no longer sell a consumer virtual private network (VPN) service, citing an uncertain legal environment that could threaten its users' privacy.
CryptoSeal is the latest company to voluntarily shut down its service after the U.S. government's legal action against Lavabit, an email service used by former NSA contractor Edward Snowden.
In a notice on its website, CryptoSeal wrote that it fears the government could force it to turn over its cryptographic keys if it cannot comply with a pen register order, which asks for certain information on users' communications.
Most email services use SSL (Secure Sockets Layer) encryption between servers and users. Obtaining the private SSL keys from a service provider would give law enforcement access to all users' communications rather than just one person.
When he shut down Lavabit, founder Ladar Levison said he could no longer guarantee that users' data was protected. Court documents showed Levison was forced to turn over Lavabit's private SSL keys. He's appealing the order in the U.S. Court of Appeals for the Fourth Circuit.
CryptoSeal said its system does not record the common information requested through a pen register order.
"The consequence, being forced to turn over cryptographic keys to our entire system on the strength of a pen register order, is unreasonable in our opinion, and likely unconstitutional, but until this matter is settled, we are unable to proceed with our service," the company wrote.
The cryptographic keys used for its consumer service, called CryptoSeal Privacy, have been "zerofilled," it said. Although it did not retain logs for the service's users, "all records created incidental to the operation of the service have been deleted to the best of our ability."
It was unclear why CryptoSeal's VPN product for businesses, called Connect, was not mentioned in the announcement. The company could not be immediately reached for comment.
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