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:
Jul. 09, 2002
Filed:
May. 05, 1998
Mark H. Etzel, Harvard, MA (US);
Robert John Frank, Silver Spring, MD (US);
Daniel Nelson Heer, Newton, NH (US);
Robert Joseph McNelis, Columbia, MD (US);
Semyon B. Mizikovsky, Morganville, NJ (US);
Robert John Rance, Andover, MA (US);
R. Dale Shipp, Columbia, MD (US);
Lucent Technologies Inc., Murray Hill, NJ (US);
Abstract
A self-inverting enhanced CMEA encryption system suitable for use in wireless telephony. An unprocessed text message is introduced into the system and subjected to a first iteration of a CMEA process, using a first CMEA key to produce a first intermediate message, a first intermediate processed text message, a first intermediate ciphertext message or the like. The first intermediate processed text message is subjected to a further iteration of the CMEA process, using a second CMEA key, to produce a second intermediate processed text message. The second intermediate processed text message is subjected to a final iteration of the CMEA process, using the first CMEA key, to produce the final processed text message. Security may be additionally enhanced by subjecting each message to an input/output transformation before and after each iteration of the CMEA process. In a three-iteration process, a total of four input/output transformations are used with the first and fourth input/output transformations being identical, and with the second and third input/output transformations being identical.