A key accessory has a low-cost and simple structure and allows a user to easily confirm on the spot that the user has performed locking even in a place where the user has gone out. A key accessory to be attached to surfaces of a holding part of a key includes: a deforming member configured to be deformed by a holding force applied when the user carries out a locking operation with the key; and a restoring member configured to cause the deforming member having a shape after having been deformed by the holding force to restore to its original shape before the deformation.

A key accessory has a low-cost and simple structure and allows a user to easily confirm on the spot that the user has performed locking even in a place where the user has gone out. A key accessory to be attached to surfaces of a holding part of a key includes: a deforming member configured to be deformed by a holding force applied when the user carries out a locking operation with the key; and a restoring member configured to cause the deforming member having a shape after having been deformed by the holding force to restore to its original shape before the deformation.

A method for detecting a change of a state of a lock by means of a device connected to a key for that lock. The method includes measuring a change of a position of the key about three axes; and indicating that the state of the lock has changed if the measured change of position of the key indicates that the key has rotated about a first axis by an angle greater than or equal to a primary threshold value and about the other two axes by an angle smaller than a secondary threshold value.

A method for detecting a change of a state of a lock by means of a device connected to a key for that lock. The method includes measuring a change of a position of the key about three axes; and indicating that the state of the lock has changed if the measured change of position of the key indicates that the key has rotated about a first axis by an angle greater than or equal to a primary threshold value and about the other two axes by an angle smaller than a secondary threshold value.

A key accessory has a low-cost and simple structure and allows a user to easily confirm on the spot that the user has performed locking even in a place where the user has gone out. A key accessory to be attached to surfaces of a holding part of a key includes: a deforming member configured to be deformed by a holding force applied when the user carries out a locking operation with the key; and a restoring member configured to cause the deforming member having a shape after having been deformed by the holding force to restore to its original shape before the deformation.

A key accessory has a low-cost and simple structure and allows a user to easily confirm on the spot that the user has performed locking even in a place where the user has gone out. A key accessory to be attached to surfaces of a holding part of a key includes: a deforming member configured to be deformed by a holding force applied when the user carries out a locking operation with the key; and a restoring member configured to cause the deforming member having a shape after having been deformed by the holding force to restore to its original shape before the deformation.

A method for detecting a change of a state of a lock by means of a device connected to a key for that lock. The method includes measuring a change of a position of the key about three axes; and indicating that the state of the lock has changed if the measured change of position of the key indicates that the key has rotated about a first axis by an angle greater than or equal to a primary threshold value and about the other two axes by an angle smaller than a secondary threshold value.

A method for detecting a change of a state of a lock by means of a device connected to a key for that lock. The method includes measuring a change of a position of the key about three axes; and indicating that the state of the lock has changed if the measured change of position of the key indicates that the key has rotated about a first axis by an angle greater than or equal to a primary threshold value and about the other two axes by an angle smaller than a secondary threshold value.

A lock apparatus including a cylinder lock and an actuation member configured to operate the cylinder lock via rotation of the actuation member with respect to a part of the cylinder lock, wherein: the cylinder lock includes a magnet, and the actuation member includes a smart actuation member circuit, the smart actuation member circuit including: one or more sensors (including one or more magnetic field sensors) configured to sense an action of the smart actuation member circuit with respect to the cylinder lock; and a processor or controller configured to receive information indicative of the sensed action from the or each sensor for use in determining a status of the cylinder lock. Furthermore, smart actuation member circuit, cylinder lock and method of fitting such a cylinder lock are claimed.

A system may include a lock assembly having a shell and a plug rotatable with respect to the shell and a lock operating object for operating the lock assembly including a key. The system may further include an audit enhancement assembly configured to facilitate creation of an audit trail of operation of the lock assembly by the lock operating object, and may include a motion sensor configured to sense rotational motion of the lock operating object and/or the plug of the lock assembly. The audit enhancement assembly may include processing circuitry in communication with the motion sensor, and memory circuitry in communication with the processing circuitry to receive and record a value derived from a motion signal from the motion sensor and a temporal value associated with a motion signal event.