Facebook-owned WhatsApp added end—to—end encryption to every conversation two years ago and made all conversations on the group private, meaning no third-party can read them, be it government, criminals or even WhatsApp itself. But according to a team of German security researchers, WhatsApp group chats might not be so secure and can easily be infiltrated without permission of the group admin.
According to a report in Wired.com, the cryptographers from Ruhr University Bochum in Germany discovered flaws in security protocol of group of three popular instant messaging apps with WhatsApp standing out considering it has 1 billion-plus user base. The researchers looked at WhatsApp, Signal and Threema and announced their findings at the "Real World Crypto Security Conference” in Zurich, Switzerland, on Wednesday (January 10).
WhatsApp says it has looked at this issue carefully.