Abstract: A device for and method of transmitting an encrypted message and an access field from a sender to a receiver, where a third party may intercept and process the transmission. The sender and receiver agree on a session key. The sender raises an element of a Galois Field to the session key; forms a temporary device unique key; encrypts the session key with the temporary device unique key; forms a temporary family key; encrypts an identifier of the sender and the encrypted session key using the temporary family key; encrypts a plaintext message using the session key; forms the access field by concatenating the element of a Galois Field raised to the session key to the encrypted version of the sender's identifier and the sender's encrypted session key; concatenates the ciphertext to the access field; and transmits the access field and the ciphertext to the receiver. The receiver may recover the plaintext from the sender's transmission.

Abstract: Weighing apparatus, which is suitable for weighing livestock. The apparatus s formed by a crate, which is open at at least one end and provides a platform on which an object to be weighed may be located, and a frame encompassing but spaced from said crate. The crate is slung by a single point from said weighing device mounted by the frame.Crate restraining means maintain said crate in a spaced relationship from the frame. The restraining means comprises a single flexible member and a single anchor point and tie on each end of said crate and a single mounting on opposite sides of said frame. The arrangement is such that in use when said flexible member is tensioned and anchored the crate is restrained from lateral movement against the frame without affecting vertical loading on the single point weighing device.