Abstract: A method is disclosed for verifying that a check user, a credit card holder, or an account user is authorized to complete a transaction. The issuer of the check or credit card or the verifying entity assigns a security code formula to each user, consisting of two variables: a base code number separated into two parts; and one or more arithmetic modes. The authorized user will calculate a verification code number in a two step process using the two parts of the base code and the check number or transaction amount; he then places it on the check or the transaction slip. Verification can be performed by the issuer, who ensures that a correct verification code number has been entered on the check or transaction slip.

Abstract: A removable storage cover for a pickup truck bed comprises a sloping back wall and a hinged top cover. The sloping back wall is secured at the bottom end on opposite sides by retractable pins which fit into holes drilled into the truck wheel wells. The top cover is hinged to the sloping back wall and closes against a pair of supporting rails on the interior side walls of the truck bed. In a second embodiment, the top end of the sloping back wall is secured to the interior side walls, and the bottom end is secured to the wheel wells of the truck bed by retractable pins which fit into holes drilled into the side walls and wheel wells. In a third embodiment, the top end of the sloping back wall rests on rubber bumpers secured in the interior side walls of the truck bed and has a peripherally extending flange which rests on the top of the side walls and the top of the tailgate when in a closed position. When the top cover is in a closed position, it may be locked by provision of a clasp and lock.