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. 19, 1988
Filed:
Apr. 05, 1982
Tore I Aaro, .ANG.kersberg, SE;
Torgny O Rustan, Stockholm, SE;
Par man, Kungsangen, SE;
Rolf J Blom, Linkoping, SE;
Robert Forchheimer, Linkoping, SE;
Viiveke A Fak, Linkoping, SE;
Bror I Ingemarsson, Linkoping, SE;
U.S. Philips Corporation, New York, NY (US);
Abstract
A method for transmitting ciphered information between two stations while using session keys. According to the method a mutual identification of the stations (AK, A; A,B) is obtained while using an identification device (ID) comprised in each station. Number values (r.sub.1, r.sub.2), originating from each station, may be exchanged by said identification in a form which is so ciphered that the number values may be recovered by the counterpart only. The session key (t.sub.m) is formed on basis of said number values in a modification device (MODIFI). Ciphered data messages are exchanged between the station using the established session key and a message ciphering/deciphering device (MCRY, MDECRY) comprised in each station. According to the method the mutual identification and the establishment of the session key via an open channel may be obtained by transmitting one separate identification sequence in each direction.