High Security Padlock

A padlock, comprising a lock cylinder rotatable between a lock position and an unlock position with rotation of a key, the lock cylinder comprising:

• a keyhole for receiving the key having a plurality of teeth and at least one indentation;
• and
• at least one first through hole extending along a first direction from the keyhole to an outer surface of the lock cylinder for housing at least one first pin, respectively;
• and
• at least one second through hole extending along a second direction from the keyhole to the outer surface of the lock cylinder for housing at least one second pin, respectively, the second direction being different from the first direction
• wherein, when the key is in the keyhole, the teeth of the key are aligned with the at least one first pin such that a proximal end of each first pin contacts with a corresponding tooth and a distal end of each first pin is at the outer surface of the lock cylinder, and the at least one indentation is aligned with the at least one second pin such that a proximal end of each second pin contacts with a corresponding indentation and a distal end of each second pin is at the outer surface of the lock cylinder, allowing the lock cylinder to rotate between the lock position and the unlock position with rotation of the key,
• wherein the padlock further comprises a lock housing comprising:
• a sleeve shaped to fit with and for receiving the lock cylinder;
• and
• a first prong extending outward from the sleeve and having a first recessed portion;
• wherein when the lock cylinder is in the lock position, the at least one first through hole is aligned with the first recessed portion, the at least one first pin is movable in the at least one first through hole and the first recessed portion, allowing the insertion or removal of the key from the keyhole,
• wherein the lock housing further comprises:
• a second prong extending outward from the sleeve and having a second recessed portion;
• wherein when the lock cylinder is in the lock position, the at least one second through hole is aligned with the second recessed portion, the at least one second pin is movable in the at least one second through hole and the second recessed portion, allowing the insertion or removal of the key from the keyhole, and
• wherein one of the first prong and the second prong extends axially across an entire length of the sleeve and the other one of the first prong and the second prong extends axially across a part of, and less than the entire length of, the sleeve.