- Millions of people use password managers. They make accessing online services and bank accounts easy and simplify credit card payments.
- Many providers promise absolute security – the data is said to be so encrypted that even the providers themselves cannot access it.
- However, researchers from ETH Zurich have shown that it is possible for hackers to view and even change passwords.
Yes of course you CAN make it safe in theory, but unless you run the web interface locally or on your own server, you cant be certain that the javascript delivered to you from the hoster hasnt been modified. Its like having autoupdates on but you have zero control over when or how the updates take place, because every time you open the page it could be different code from the last time.
How do you know that the code on elements github repo is actually the same code that you get delivered from your homeserver that is hosting the web client? Your homeserver can just modify the web clients code however it wants and deliver a backdoored or faulty version to you. Which means you dont just have to trust the open source code, but also the admin who is managing the homeserver and also the hosting provider.
Is this really so hard to understand? Literally the entire client is delivered on demand from a remote server, obviously that is insecure if you dont control that server.