Abstract: A tilt and swivel apparatus supports a structure such as a CRT display device above a stable base. Separate tilt and swivel mechanisms are provided to improve the stability of the apparatus. Stop elements limit the extent of tilting and rotation which is permitted. An internal passage is provided for cable connections to the supported structure.

Abstract: An encrypter for encoding and decoding data, wherein clear text data to be encoded is logically combined with a portion of a non-linear pseudo-random bit sequence signal to provide a partially encoded signal. The bit sequence of the non-linear pseudo-random signal is chosen in accordance with a user selected key. A shuffle register receives the partially encoded signal and interchanges the positions of the bits making up the partially encoded signal in accordance with a user selected key to provide the fully encoded signal. The fully encoded signal may then be recorded, for example, on the magnetic stripe of a credit card.Means are provided for decoding the above described encoded signal using the same portion of the nonlinear pseudo-random bit sequence that was used for encoding.