top body member 12 is placed over and attached to bottom body member 16 the upper surface of i beam 39 adheres to the lower surface of the top body member thus if an authorized card user or any other unauthorized person were to attempt to discover the secret code by a visual inspection of the relationship between the user dials and the cylinders with their protuberances such an attempt would fail upon lifting the top body member to open the positive identification device to physical inspection the i beam which is adhered to the top body member is pulled up along with it the remainder of the assembly is held in place by support members 33 therefore spacers 37 become disengaged from spacer rims 55 as shown in fig9 whereupon the user dials 22 and cylinders 35 are pushed and spun away from each other therefore the relationship between the dials and the drums is destroyed thus preventing the discernment of the secret codes which complement the visible identification information the authentication devices are easy and inexpensive to manufacture also the alignment of the dials and cylinders can be changed periodically new cylinder to dial relationships create new groupings of resultant electrical connections thus making the old secret codes inoperative at the time that the new alignments are made authorized card users are informed of their new secret codes thus any unauthorized user would not be able to know what the current secret code is for the card he.