Data security

["Thiago Lima " <thiagolima () webforce com br>]

        I have some information (ips/logins/passwords) that I want to be
stored securely.

        However I have 5 other users in my local network that should be able
to read those infos.

        There's any tool that can help me to store this info securely and
only let users extract those infos using a password or maybe an certificate?
I want to be able to grant/revoke permissions to some fields or info.

        Looking for opensource or commercial solutions.

Regards
Thiago.