Signal messaging app turns over minimal data in first subpoena

SAN FRANCISCO (Reuters) - Open Whisper Systems, the developer of encrypted messaging app Signal, received a subpoena earlier this year requesting user information but was only able to supply the duration of a user's membership, according to court documents unsealed last week. An assistant attorney in the U.S. state of Virginia requested email addresses, history logs, browser cookie data and other information associated with two phone numbers as part of a grand jury probe, the redacted documents