WhatsApp: the encryption protects a stranger's device too

[Redaktion]

Under the list of your linked devices sits a reassuring line about end-to-end encryption. It is even true. That encryption just protects every linked device alike, including one that is not yours. The BSI has warned about a scheme built on exactly that, and the list never tells you when a device was added.

https://www.notebookcheck.net/WhatsApp-the-encryption-protects-a-stranger-s-device-too.1382740.0.html