Some years ago I had an extensive look into the server-side encryption and also published a paper about several cryptographic vulnerabilities that I found in the implementation. Since then it has become a bit quiet about the developed scripts...
...until now. In the spring of 2023 the former Nextcloud-Tools moved under the umbrella of the Nextcloud project and have been renamed to the Nextcloud Encryption Recovery Tools. This change has kicked off some major improvements that have been lingering for years:
recover.php script left that tries to automate the decryption as much as possible. Through this change it should be easier for users to identify the script that they are supposed to use.
In the last couple of years I talked to about a dozen of users ranging from single persons to companies and NGOs who saved millions of files that could have been lost otherwise. Hopefully, these changes and improvements will help even more Nextcloud users to restore their precious files in cases where they encrypted them and lost their working Nextcloud installation. 🙂