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Very fun read:
https://www.deepdotweb.com/2016/03/12/does-qube-os-has-a-leak-hole/

Some parts:

"According to technical documentation concerning Qubes structure,
domains are separated from each other  via encryption . Like the Dom0,
the storage domain is literally protected from other domains via
encryption to prevent viruses in other domains [ such as Network Vm ]
from penetrating into each other."

"Seemingly, Qubes OS depends on a backup system to prevent huge mass
of data.  In default, the backup system relies on weak key derivation
scheme . So it is recommended that users select a high-entropy
passphrase for use with Qubes backups  ."


"Qubes allows users not to ‘send’ or ‘transport’ but to copy and paste
files and folders . Let’s assume users download a file or a program
from a ‘phished’ website ( designated as an https website )
unknowingly . Later, the file or program downloaded from the phished
website is copied from the App Vm to the Storage Vm.

The storage Vm is encrypted from the Network Vm to prevent replication
of malwares ( i.e virus ) .  Can the encryption method employed to
prevent malicious software in the programs or folders on the App Vm
from attaching itself to the Storage Vm ?"

Has some Qubes dev contacted with this guys?
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