A team of German cryptographers has discovered flaws in WhatsApp's Group chats despite its end-to-end encryption, that makes it possible to infiltrate private group chats without admin permission.
According to a report in Wired.com, the cryptographers from Ruhr University Bochum in Germany announced this at the "Real World Crypto Security Conference in Zurich, Switzerland, on 10 January.
"Anyone who controls the app's servers could insert new people into private group chats without needing admin permission," the report said, citing cryptographers.
The WhatsApp attack on group chats takes advantage of a bug.
"Only an administrator of a WhatsApp group can invite new members, but WhatsApp doesn't use any authentication mechanism for that invitation that its own servers can't spoof," the report said.
So the server can simply add a new member to a group with no interaction on the part of the administrator.
"The phone of every participant in the group then automatically shares secret keys with that new member, giving him or her full access to any future messages," the report added.
With over 1.2 billion monthly active users, WhatsApp is available in more than 50 different languages around the world and in 10 Indian languages.
"He can cache all the message and then decide which get sent to whom and which not," Rosler said.
A WhatsApp spokesperson confirmed the findings to Wired, however adding that "no one can secretly add a new member to a group and a notification does go through that a new, unknown member has joined the group".
"We've looked at this issue carefully," the spokesperson added.
According to WABetaInfo, a fan site that tests new WhatsApp features early, the popular mobile messaging platform has submitted the "Restricted Groups" setting via Google Play Beta Programme in the version 2.17.430.
Once restricted, other members will simply have to read their messages and will not be able to respond. They will have to use the "Message Admin" button to post a message or share media to the group.
(The copy has been published in an arrangement with IANS)
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