I have files in my computer that are being uploaded to a cloud storage provider (Sync) that specifies that files are encrypted on the client's side, then uploaded to their servers, and that only has the key to decrypt the files. So files can only be decrypted on my computer.
Now my question is:
Do encryption hide file name and hash?
Can such cloud providers identify the files by their names or hash if they are encrypted?
I know identifying files like this is a common process to avoid file duplication (Dropbox does this for example), so I am wondering if by encrypting files they lose this ability.
Not planning on having anything illegal (on purpose) in those folders (ie. music, movies, software), so I'm not worried in that sense.
BUT, my sister's account in Dropbox was just deactivated for "breach of terms" and she didn't have anything illegal there either "that she knows of", I say this because she had whatsapp backing up images to a folder that was being synchronised to the cloud, also family photos of toddler nephews (sometimes innocent photos or them having a bath) so not sure if any meme or joke images from group chats was flagged or maybe some random file having virus (this is also specified in their terms as a possible breach of terms)... Dropbox doesn't specify and they don't comment on why they deactivated your account "for legal reasons" WTF! So you're left wondering what you did wrong... if anything at all.
So, I decided to leave Dropbox too (specially because I had offline files there that were not being sync'ed to my computer, so have to buy an extra HDD to fix that now!) and I am trying to understand how safe my files would be with this new provider I intend to use (Sync), as they say files are encrypted on my end and uploaded to their servers encrypted.
Don't know... I think maybe encrypting files on my end with another software is an overkill in this situation, just wanted to know at what extent my files are private. Maybe I'm getting a little bit paranoid here - or maybe not - I'm no CIA agent, but you know, here in Australia things are going crazy. People have been taken by the police from their own home for things they have posted in Social Media that go against the current official narrative (virus related), so... who knows!.
Anyway, I know my question is a bit long but just wanted to add some context.
Thanks for your comments!