Researchers from Ruhr-Universität Bochum (RUB) in Germany discovered that anyone who controls Whatsapp/Signal users can secretly add new members to any private group, thus giving them access to spy on group conversations without the permission of the administrator.
According to the researchers, in a private conversation between two users, server plays a limited role but in case of multi-user chats (group chat where encrypted messages are broadcasted to many users), the role of servers increases to manage the entire process.
Besides this, an infiltrator can manipulate the server to selectively block any messages in the group, including those that ask questions, or provide warnings about the new entrant. Hence, no one will get notified when the person gets added to the group.
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