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:
Sep. 01, 2015
Filed:
Sep. 03, 2013
Cisco Technology Inc., San Jose, CA (US);
Erez Waisbard, Or-Yehuda, IL;
Hillel Solow, Beit Shemesh, IL;
Cisco Technology Inc., San Jose, CA (US);
Abstract
A method and system of preventing control word sharing, the method and system including receiving a temporal key, denoted TK, at a removable security element, receiving an entitlement control message (ECM), the ECM including a control word derivable by the removable security element, deriving the control word from the ECM at the removable security element, combining at least the control word and a value associated with an ID of the removable security element, thereby producing combined control word and removable security element ID data, encrypting the combined control word and removable security element ID data according to an encryption function, wherein the encrypting includes using TKas an encryption key, and at a time after a removable security element interface has received TK, but prior to a start of a crypto period with which the control word is associated, sending the encrypted combined control word and removable security element ID data to the removable security element interface. Related apparatus, methods and systems are also described.