An electromechanical lock comprising: an electronic circuit configured to read data from an external source and match the data against a predetermined criterion; an actuator comprising a permanent magnet arrangement movable from a locked position to an open position by electric power; and an access control mechanism configured to be rotatable by a user; wherein in the locked position, the permanent magnet arrangement is configured and positioned to create and direct a near magnetic field to block the access control mechanism to rotate, and simultaneously the permanent magnet arrangement is configured and positioned to create and attenuate a range and a magnitude of the near magnetic field towards a far magnetic break-in field originating from outside of the electromechanical lock, whereas in the open position, the permanent magnet arrangement is configured and positioned to create and direct a reversed near magnetic field to release the access control mechanism to rotate, and simultaneously the permanent magnet arrangement is configured and positioned to create and attenuate a range and a magnitude of the reversed near magnetic field towards the far magnetic break-in field, wherein the access control mechanism comprises one or more movable magnetic pins (220, 240) configured and positioned to block the access control mechanism to rotate when affected by the near magnetic field (280A, 280B), or to release the access control mechanism to rotate when affected by the reversed near magnetic field (410A, 410B), and wherein the permanent magnet arrangement comprises a first axis between poles, and the magnetic pin (220, 240) comprises a second axis (272, 274) between poles, and the first axis is transversely against the second axis (272, 274) both in the locked position and in the open position. an electronic circuit configured to read data from an external source and match the data against a predetermined criterion; an actuator comprising a permanent magnet arrangement movable from a locked position to an open position by electric power; and an access control mechanism configured to be rotatable by a user; wherein in the locked position, the permanent magnet arrangement is configured and positioned to create and direct a near magnetic field to block the access control mechanism to rotate, and simultaneously the permanent magnet arrangement is configured and positioned to create and attenuate a range and a magnitude of the near magnetic field towards a far magnetic break-in field originating from outside of the electromechanical lock, whereas in the open position, the permanent magnet arrangement is configured and positioned to create and direct a reversed near magnetic field to release the access control mechanism to rotate, and simultaneously the permanent magnet arrangement is configured and positioned to create and attenuate a range and a magnitude of the reversed near magnetic field towards the far magnetic break-in field, wherein the access control mechanism comprises one or more movable magnetic pins (220, 240) configured and positioned to block the access control mechanism to rotate when affected by the near magnetic field (280A, 280B), or to release the access control mechanism to rotate when affected by the reversed near magnetic field (410A, 410B), and wherein the permanent magnet arrangement comprises a first axis between poles, and the magnetic pin (220, 240) comprises a second axis (272, 274) between poles, and the first axis is transversely against the second axis (272, 274) both in the locked position and in the open position.