| SAN FRANCISCO
SAN FRANCISCO Oct 4 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 showed. The request was
made in the first half of this year, the documents showed.
Citing its encryption technology, which is also used in
other messaging services such as Facebook Inc's Whatsapp,
Open Whisper Systems said it was only able to supply the
registration date and the last date one of the numbers was used.
The company had no information about the other number, according
to the documents.
"We've designed Signal so it minimizes the amount of data we
retain on users, and we don't really have anything to respond
with in situations like this," Open Whisper Systems security
expert Moxie Marlinspike told Reuters.
The subpoena was the first the company has received, he
More than 2 billion people use a form of Signal's code,
though companies licensed to use the code keep related
information about users, Marlinspike said.
(Reporting by Joseph Menn; Editing by Christopher Cushing)