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:
Aug. 22, 2006
Filed:
Mar. 29, 2002
Robert D. Logalbo, Hoffman Estates, IL (US);
Alan Conrad, St. Charles, IL (US);
Darrell Stogner, Planation, FL (US);
Robert D. Logalbo, Hoffman Estates, IL (US);
Alan Conrad, St. Charles, IL (US);
Darrell Stogner, Planation, FL (US);
Motorola, Inc., Schaumberg, IL (US);
Abstract
Encryption synchronization (e-sync) is maintained between a transmitter () and one or more receivers () in a multi-modulation TDM system () where information is communicated in slots () comprising a slot header () and one or more data blocks (), and wherein the data blocks are eligible to be encoded at different modulation rates thereby creating a likelihood of different numbers of blocks in different slots. The receiver and transmitter employ respective encryption elements () comprising e-sync shifter elements () and encryption algorithm blocks (). The e-sync shifter element provides an e-sync signal defining an encryption state vector to the encryption algorithm block and is operable to advance the encryption state vector (in the case of the receiver) according to a number of received bits plus a variable number of bits. The variable number depends on the number of bits within a block, the maximum number of blocks that could be within a slot and the actual number of blocks within the slot.