Device for the protection of access to a permanent memory of a p

Details Device for the protection of access to a permanent memory of a p Device for the protection of access to a permanent memory of a p

1980-04-07

1981-10-13

Pitts, Harold I.

Selective cutting (e.g., punching)

With means to impose randomly actuated control of...

Embodying means to detect indicium in work or pattern

235488, G06K 1906

Patent

active

042950414

ABSTRACT:
A portable data or information carrier in the form of a card or the like. In order to maximize the confidentiality of information stored in the carrier, and more specifically to limit the amount of information available to a would-be defrauder monitoring data lines connecting the data carrier to external devices, the data carrier includes a microprocessor and an operatively associated protected memory to which access is protected. The memory includes at least one key or code which is compared to a key received from a device external to the data carrier to determine whether a particular operation is authorized. To ensure that the data carrier consumes the same amount of current whether the requested operation is authorized or unauthorized, the data carrier includes "access" and key "error" memory elements of the Electrically Alterable Read Only Memory (EAROM) type, and a bit is stored in the respective memory element in either event.

REFERENCES:
patent: 3971916 (1976-07-01), Moreno
patent: 4001550 (1977-01-01), Schatz
patent: 4007355 (1977-02-01), Moreno
patent: 4092524 (1978-05-01), Moreno
patent: 4102493 (1978-07-01), Moreno
patent: 4105156 (1978-08-01), Dethloff
patent: 4211919 (1980-07-01), Ugon

Affiliated with

Also associated with

Rating

Device for the protection of access to a permanent memory of a p does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Device for the protection of access to a permanent memory of a p, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Device for the protection of access to a permanent memory of a p will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-932663