http://ssd.iykpqm7jiradoeezzkhj7c4b33g4hbgfwelht2evxxeicbpjy44c7ead.onion/zh-hans/module/communiquer-avec-autrui
Many groups, including EFF, spend time watching well-known providers—like Signal or WhatsApp (which is owned by Meta)—to make sure they really are providing the end-to-end encryption they promise. There are many other chat services that may claim to use end-to-end encryption, but if they are not open-source or do not use established encryption protocols, like the Signal protocol , and are not popular enough that security researchers pay attention, they may come with some risk of use.