I am sure that Tutanota does not use any custom encryption algorithm. It is clearly stated in the FAQ that they use RSA (with PFS) and AES to encrypt emails exchanged between Tutanota users. tutanota.com/encryption
These are only primitive algorithms, the actual implementation is custom and specific to Tutanota, which mean it will only work with Tutanota as nothing else will implement it.
There is no way to do key distribution outside of Tutanota’s service.
sanpo@sopuli.xyz 1 year ago
I’m not really saying that what Tutanota does is insecure, but historically doing security on your own instead of using established standards has not been a winning move.
Plus their unwillingness to open source it and not sharing the audits just doesn’t inspire my confidence.
Overall they’re probably fine, but these are some of the main reasons I ultimately chose Proton instead.
BTW, they’re not “slowly developing” post-quantum encryption, they’re just saying they may do that at some point in the future - which everyone will have to do anyway when we get to this point.
dngray@lemmy.one 1 year ago
The server side isn’t open source, and you can’t verify that is what is actually running in production. While we do recommend it I don’t personally use their products.I like the use of email clients, particularly customized to my needs.
Nested folders was only a very recent feature added tutanota.com/blog/posts/subfolders and without that I wouldn’t even consider a provider as I use this for organization. Of course as you can’t use your own email client, downloading email from Tutanota can be a bit of a pain too, you can only export per-folder into Mbox.