Portable data carrying device

Details Portable data carrying device Portable data carrying device

1989-04-05

1991-01-15

Tarcza, Thomas H.

Cryptography

Particular algorithmic function encoding

Nbs/des algorithm

235380, H04L 900

Patent

active

049859218

ABSTRACT:
With portable data carrying devices, which are intended for the required connection (for example by means of contacts 9) to an external read/write unit in a data exchange system and which contain besides a control unit (2) an additional data memory (5) (both implemented as integrated circuits), a high level of security should be achieved against access to the stored data and manipulations without authorization. For this purpose entry to the additional data memory (5) from the control unit (2) is protected. Various possibilities are specified such as access coding, cryptographic circuit means and methods or secret microcodes. The data carrying device (1) can be implemented with two or more separate integrated circuit components interconnected by a multiple conductor strip (3) (multi-chip), or with all functional units integrated on a common carrier (single chip).

REFERENCES:
patent: 4453074 (1984-06-01), Weinstein
patent: 4575621 (1986-03-01), Dreifus
patent: 4799061 (1989-01-01), Abraham et al.
patent: 4823388 (1989-04-01), Mizutani et al.
patent: 4827512 (1989-05-01), Hirokawa et al.

Affiliated with

Also associated with

Rating

Portable data carrying device does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Portable data carrying device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Portable data carrying device will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-60509