The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 20, 1987
Filed:
Jan. 21, 1986
Robert J Herve, Versailles, FR;
Abstract
In a system for the transmission of confidential data between a transmitter 1) and a receiver (3), the transmitter (1) transmits a standard key E to the receiver (3). The standard key E preferably is a random number generated within the transmitter (1). An element at the location of the transmitter (1) calculates an intrinsic key R.sub.1 for coding the data to be transmitted, and an element at the location of the receiver calculates an intrinsic key R.sub.2 for decoding the data. The calculation of each of the intrinsic keys R.sub.1 and R.sub.2 is accomplished in each case by a microprocessor (4' and 5') situated within a portable object (4 and 5) which also includes a memory (4' and 5') storing a program, a secret code S, and an identification code I.sub.n. The intrinsic keys R.sub.1 and R.sub.2 are each calculated as a function of the secret code S, the identification code I.sub.n, and the standard key E. The portable objects at the transmitter and receiver ends of the system must be matched.