I'm new to cryptography and have been using this service for a couple weeks now.
I'm using an online account and have downloaded my key file just "in case".
The Technical Overview article (https://www.boxcryptor.com/en/technical-overview/) explains "As the sensitive information in the key file (e.g. private keys) is encrypted, users can store the key file in their cloud storage."
I understand the private-key is encrypted in this file, but if my cloud storage did have a breach. Would this key not be a great starting point to hack the encryption?
In other words, the hacker now has my Boxcryptor username and encrypted private-key (both are stored on the key server?). Would this information not be valuable to brute-force their way into cracking the password/passphrase?
I hope that is clear. I may just not completely understand the process.
Would anyone mind shedding some light on this?