Digitally programmable protecting means and a key for mechanical rotary locking devices

A digitally programmable protecting mechanism and a programmable key for a mechanical rotary lock for providing enhanced protection and enabling user to change mechanical and electronic security code configuration at any time without involving of special tools. The device includes a mechanical digitally configurable key where the protecting binary code configuration is formed by cylindrical binary coding members put on a central core of the key, and an electronic programmable digital module attached to a mechanical rotary lock for capturing the key code configuration, verifying, and releasing the lock if the verification proves that the key coding configuration and the electronic module coding are matched.