As far as I know, it is not possible to put an encrypted password in any process that automates a SQL Server install.
An alternative might be to pass the password from a .bat file, and encrypt the .bat file. Another alternative would be to change the password after the install is complete.
Original author: https://github.com/SQL-FineBuild/Common/wiki/ 1-click install and best practice configuration of SQL Server 2019, 2017 2016, 2014, 2012, 2008 R2, 2008 and 2005.
When I give food to the poor they call me a saint. When I ask why they are poor they call me a communist - Archbishop Hélder Câmara