ASIS: Advanced Simple Installer Script

[KaktoR]

Set password in Records.ini

[Record#]
...
...
Password=Your password

Include records.ini in Setup.dll and set a password for Setup.dll
Set password for Setup.dll in script.iss

#define PasswordDLL "Your password"

However full encryption is not possible this way. People can still read the password from %temp% folder. You have to use a custom arc.exe to fully encrypt the files (this requires some script editing I guess, not sure).

[Masquerade]

If you use ProFrager's FAProtect to generate custom FreeArc binaries so others cannot open them, all you'd need to do is swap the unarc.dll from the ASIS package with your custom generated unarc.dll to decompress the archives.

This does not encrypt the archives per-se, because if you open them with a hex editor you will still be able to see magic numbers of compressors that you used when making the archive, so you will be easily be able to tell at LEAST the final compressor used if not more. That is, unless, you add encryption to the archive in FA cmdline which I have no idea about. It'll probably just slow unpacking down. If all you want to do is stop people from easily looking at what your methods are, just use FAProtect. Then only skilled people will know