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Using a secure system
How system security works
Login security
What to do if you cannot log in
Password security
Changing your password
If you are not allowed to change your password
If you are allowed to change your password
File security
Security for files in sticky directories
Other security tips
Using su to access another account
Using commands on a trusted system
Authorizations
Listing authorizations and running authorized commands
Data encryption
crypt--encode/decode files