A secured housing for an electronic device having an electronic memory mounted therewithin is provided which has as access aperture which provides tamper proof security and electro-magnetic interference protection while permitting access to the memory for reading the information maintained in the memory. Opening of the access aperture disables the electronic device from further operation by unlatching a switch which disconnects the electronic device from its power supply while preventing relatching of the switch to reactivate the electronic device. Use of the access aperture provides a visible indication of access to the interior of the housing. In one embodiment of the invention, the electronic device is an electronic postage meter and the electronic memory is a nonvolatile memory containing postage accounting information.
A tamperproof arrangement for an integrated circuit device. The arrangement includes a package and lid fabricated of heavy metals to prevent X-radiation or infrared detection of circuit operation. Sensors and control circuitry are located on the integrated circuit die itself which detect increased temperature and radiation and clear or zeroize any sensitive information included within the integrated circuit device. Electrode finger grids above and below the integrated circuit die detect physical attempts to penetrate the integrated circuit die. Critical circuit functions are segregated from non-critical functions. Power applied to the integrated circuit device is monitored and separated for critical and non-critical circuit functions.
This invention relates to apparatus for estimating body alcohol concentration from personal body characteristics. For example, a calculator 10 has a keyboard 12 through which the user can input information concerning his sex, body weight, degree of fat, food consumption, alcohol consumption and the timing of these last two events. Depending on the mode into which the apparatus is set, the user can be told his maximum body alcohol concentration, how much more he may drink before reaching a legal limit, or when he may achieve the legal limit if he drinks no more.
A secure housing for an electronic unit, in particular a franking machine has a first housing part and a second housing part releasably connected to the first housing part via at least one connecting device. In order to prevent the housing from being opened without leaving trace of the opening, there is provided at least one covering device on and/or in the first or second housing part. The covering device blocks the access to the connecting device and can only be removed from the first or second housing part with noticeable damage being caused.
A nonvolatile memory storage device for a programmable controller to provide an archival back-up for user programs with the use of a battery or other alternate back-up power source. The device can be attached to the programmable controller using a frangible tampering indicator that will break on the removable of the device from the programmable controller.
An information transport system for conveying information between a franking meter machine and a post office equipment includes a unit having a non-volatile read/write memory which may consist of an EEPROM which can be transported between the meter and the equipment. When the unit is inserted in the franking machine a transaction code is verified by comparison with a registered code and information transfer is effected. The machine then generates a new code and stores it in a register. Upon return of the unit to the post office, the equipment responds to the transaction code stored in the unit to generate a new code corresponding to the new code generated and stored in the meter machine.
