A lock assembly (10) including a plug (12) having a keyway (14) for inserting therein a key (16), the plug (12) arranged for movement in a bore (18) formed in a lock body (20) along a shear line (24) defined between an outer perimeter of the plug (12) and an inner perimeter of the bore (18), and at least one movable element (26, 28) slidingly disposed in an opening formed in the plug (12), wherein insertion of the key in the keyway (14) without movement of the plug (12) in the lock body (20) does not align the at least one movable element (26, 28) with the shear line (24), but movement of the plug (12) in the lock body (20) with the key (16) inserted in the keyway (14) aligns the at least one movable element (26, 28) with the shear line (24).
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