Starting in the Solaris Express 2/06 release, the Automated Security Enhancement Tool (ASET) checksum functionality provided by aset in the /usr/aset directory is no longer available.
You can find this functionality in one of the following alternative sources:
The basic audit reporting tool, bart, in Solaris 10 OS
The Solaris Security Toolkit found at http://www.sun.com/software/security/jass/
The Solaris Fingerprint Database found at http://sunsolve.sun.com/pub-cgi/show.pl?target=content/content7