公开(公告)号：US09973334B2

公开(公告)日：2018-05-15

申请号：US15068591

申请日：2016-03-13

Applicant: Cisco Technology, Inc.

Inventor： Eliphaz Hibshoosh ,  Aviad Kipnis ,  Andrew Sinton

IPC: H04L29/06 ,  H04L9/00 ,  H04L9/30 ,  H04L9/08

CPC classification number: H04L9/008 ,  H04L9/0838 ,  H04L9/3026

Abstract: One embodiment of the invention includes a method, including performing, a symmetric homomorphic encryption of a secret SA with a cryptographic key H as input yielding a homomorphic encryption result SA*, sending SA* for mathematical combination by at least one device with at least one secret SB yielding G*, the device A not having access to SB, the at least one device not having access to SA and not having access to H, receiving G*, performing a symmetric homomorphic decryption of data based on G* with H as input yielding a first decrypted output, determining a symmetric cryptographic key KA based on the first decrypted output for secure communication with a first device which is operationally connected to, or includes, a tamper resistant security system including SA and SB therein, securing data using KA yielding secured data, and sending the secured data to the first device.

公开(公告)号：US09713070B1

公开(公告)日：2017-07-18

申请号：US15239874

申请日：2016-08-18

Applicant: Cisco Technology, Inc.

Inventor： Harel Cain ,  Michal Devir ,  Yaron Sella ,  Andrew Sinton

IPC: H04W48/10 ,  H04W4/02

CPC classification number: H04W48/10 ,  H04W4/021

Abstract: In one embodiment, a system includes a control word processor to generate first regional-specific control word formation data items (RSCWFDI), for a first geographical sub-region of a primary geographical region which includes different geographical sub-regions, for use over cryptoperiods, the first RSCWFDI being used in generating control words in receiver-decoder devices, an encryption engine to encrypt content with the control words over the cryptoperiods yielding encrypted content, a first transmission apparatus to broadcast the first RSCWFDI and the encrypted content in the primary geographic region, and a communication interface to share data about second RSCWFDI of the first geographical sub-region with at least one regional transmission apparatus of the first geographical sub-region operative to broadcast the second RSCWFDI of the geographical sub-region in the geographical sub-region, wherein each control word may be generated in the receiver-decoder devices using one of first and one second RSCWFDI.