The Web-based System Manager Security file set, sysmgt.websm.security, where available, can be found on the AIX 5.2 Expansion Pack.
An additional file set, sysmgt.websm.security-us, with stronger encryption capabilities, is available on the AIX 5.2 Expansion Pack that ships in some countries. This file set requires that you have sysmgt.websm.security installed.
Web-based System Manager Remote Client Security must also be installed on the Windows or Linux clients. See Installing Web-based System Manager Remote Client Security.