The US government "fatally undermined" Lavabit, the secure email service used by whistleblower Edward Snowden, when it demanded access to encryption keys that kept the service secure, the American Civil Liberties Union said in court filings on Friday.
The ACLU has filed a "friend of the court" briefing in defence of Lavabit and its founder, Ladar Levison, who faces contempt of court charges after his decision to close down his service rather than co-operate with US authorities.
ACLU lawyer Catherine Crump said the government's "unreasonably burdensome" demands "fundamentally destroyed the company as a whole".
"Lavabit's business was predicated on offering a secure email service, and no company could possible tell its clients that it offers a secure service if its keys have been handed over to the government," Crump said.
Lavabit closed its service in August after the US authorities demanded he hand over the encryption keys for its entire service – a move Levison said would have compromised the personal details of his 40,000 clients.
Levison had previously offered the FBI access to the account that is believed to have been used by Snowden. The name of the FBI's target is redacted in court documents, and Levison is gagged by a court order from commenting.
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Lavabit is currently fighting its contempt charges and has filed briefs arguing that the US investigation violated its constitutional fourth amendment right to protection from unreasonable searches. The company has set up a legal fund to help with the costs that has so far raised $96,000.
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