# Security # Authentication and Account Password
IT has a centralized authentication system, that is, a unique identification system, which allows all its users to access the various informed services, using the same authentication credentials - the same username and password.
Given the degree of criticality of this keyword, which allows access to multiple computer services, were used according to the following rules:
- A keyword must have at least eight characters and three different variants (uppercase, lowercase, numbers and punctuation);
- The password must be renewed periodically by the user;
You can change your password at [https://password.co.it.pt](https://password.co.it.pt/)