Before you begin: You need to have set up a secure environment for your system.

Perform the following steps to ensure that the system stays secure.

1. Check each program that you want to introduce into the system. Add a program only if you are certain that it will not lower the level of security.

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2. For users of the system, set up rules for:
   • Sharing data in files
   • Specifying permission bits when creating files or using the chmod command or chmod() callable service

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3. Require that users set the permission bits for their files to deny access to all users except themselves, as the file owners.

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4. Protect all local data sets with a RACF® profile that specifies UACC(NONE). Only administrators with responsibility for creating, restoring, or dumping local data sets should be permitted to this profile.

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When you are done, you have taken steps to ensure that your system stays secure.