To stop unauthorised access to the computer systems we should:
To stop unauthorized access to the computer systems we should have a good password policy.
A password policy is a set of rules designed to enhance computer security by encouraging users to employ strong passwords and use them properly. A password policy is often part of an organization's official regulations and may be taught as part of security awareness training.
A Strong password is defined as a password that is reasonably difficult to guess in a short period of time either through human guessing or the use of specialized software.
1) Never keep a default password. Passwords such as "password," "root," "admin," or no password at all allow easy access to your computer or Internet accounts.
2) Change passwords often. It is recommended at least once every few months.
3) Create a BIOS password.
4) When creating a password, add numbers or other characters to the password to make it more difficult to guess; for example, 1mypassword23!.
5) Do not use sticky notes around your computer to write down passwords. Instead use a password manager.