Secure Login - Two-factor authentication (2FA) for Atlassian Tools

The default login for Atlassian tools is based on username and password: this is not a strong authentication as both values can be easily passed or copied to other persons using them in parallel to the owner. A secure login depends on multiple aspects and combine e.g. knowledge with physical gadgets, which cannot be duplicated that easily. If the gadget will be stolen, it is useless without the knowledge aspect. One sample of such a secure login is a 2-factor authentication using username/password and a mobile device as keycode generator or authenticator.