公开(公告)号：CA2623182C

公开(公告)日：2014-10-07

申请号：CA2623182

申请日：2006-09-11

Applicant: IBM

Inventor： LOTSPIECH JEFFREY BRUCE ,  NIN SIGFREDO ISMAEL ,  JIN HONGXIA

IPC: H04L9/08

Abstract: A system, method, and computer program product to renewably prevent traitors in a broadcast encryption system from re-using compromised keys. A license agency assigns individual receivers a set of Sequence Keys preferably at manufacture, and assigns Sequence Key Blocks (SKBs) to protected content files to be distributed. The files may be distributed on prerecorded media and typically include several file modifications . The particular modifications in a pirated version of a file can help identify which traitors contributed to its theft. SKBs assigned to new files distributed after traitors have been identified cannot be usefully processed using the compromised keys employed in previous content piracy. Innocent receivers that happen to have compromised key(s) in common with traitors can use a replacement uncompromised Sequence Key from the set to usefully decrypt content. Traitors will however step through all their Sequence Keys without reaching one that will work.

公开(公告)号：BRPI0617419A2

公开(公告)日：2011-07-12

申请号：BRPI0617419

申请日：2006-09-11

Applicant: IBM

Inventor： LOTSPIECH JEFFREY BRUCE ,  NIN SIGFREDO ISMAEL ,  JIN HONGXIA

IPC: H04L9/08

Abstract: A system, method, and computer program product to renewably prevent traitors in a broadcast encryption system from re-using compromised keys. A license agency assigns individual receivers a set of Sequence Keys preferably at manufacture, and assigns Sequence Key Blocks (SKBs) to protected content files to be distributed. The files may be distributed on prerecorded media and typically include several file modifications. The particular modifications in a pirated version of a file can help identify which traitors contributed to its theft. SKBs assigned to new files distributed after traitors have been identified cannot be usefully processed using the compromised keys employed in previous content piracy. Innocent receivers that happen to have compromised key(s) in common with traitors can use a replacement uncompromised Sequence Key from the set to usefully decrypt content. Traitors will however step through all their Sequence Keys without reaching one that will work.

公开(公告)号：DE602006007019D1

公开(公告)日：2009-07-09

申请号：DE602006007019

申请日：2006-09-11

Applicant: IBM

Inventor： LOTSPIECH JEFFREY BRUCE ,  NIN SIGFREDO ISMAEL ,  JIN HONGXIA

IPC: H04L9/08

Abstract: A system, method, and computer program product to renewably prevent traitors in a broadcast encryption system from re-using compromised keys. A license agency assigns individual receivers a set of Sequence Keys preferably at manufacture, and assigns Sequence Key Blocks (SKBs) to protected content files to be distributed. The files may be distributed on prerecorded media and typically include several file modifications. The particular modifications in a pirated version of a file can help identify which traitors contributed to its theft. SKBs assigned to new files distributed after traitors have been identified cannot be usefully processed using the compromised keys employed in previous content piracy. Innocent receivers that happen to have compromised key(s) in common with traitors can use a replacement uncompromised Sequence Key from the set to usefully decrypt content. Traitors will however step through all their Sequence Keys without reaching one that will work.

公开(公告)号：ES2327273T3

公开(公告)日：2009-10-27

申请号：ES06793423

申请日：2006-09-11

Applicant: IBM

Inventor： LOTSPIECH JEFFREY BRUCE ,  NIN SIGFREDO ISMAEL ,  JIN HONGXIA

IPC: H04L9/08

Abstract: Un método para prevenir la reutilización de claves comprometidas en un sistema de codificación de emisión, caracterizado por: (a) incorporar un conjunto particular de claves de secuencia asignadas por una agencia de licenciamiento a receptores individuales; (b) asignar un bloque de claves de secuencia (en adelante SKB) por la agencia de licenciamiento al menos a un archivo protegido distribuido; (c) pruebas criptográficas incrementales por los receptores individuales para determinar (200) si una clave de secuencia seleccionada está comprometida; (d1) si la clave de secuencia seleccionada no está comprometida, entonces descodificar adecuadamente en respuesta (202) el archivo y finalizar el método; (d2) si la clave de secuencia seleccionada está comprometida, entonces determinar en respuesta (204) si se dispone de una clave de secuencia subsiguiente del conjunto; (e1) si está disponible una clave de secuencia subsiguiente, entonces seleccionar (206) esa clave de secuencia subsiguiente y volver a la etapa (c); y (e2) si no está disponible una clave de secuencia subsiguiente, entonces el método termina (208) sin descodificar apropiadamente el archivo.

公开(公告)号：CA2623182A1

公开(公告)日：2007-04-12

申请号：CA2623182

申请日：2006-09-11

Applicant: IBM

Inventor： LOTSPIECH JEFFREY BRUCE ,  NIN SIGFREDO ISMAEL ,  JIN HONGXIA

IPC: H04L9/08

Abstract: A system, method, and computer program product to renewably prevent traitors in a broadcast encryption system from re-using compromised keys. A license agency assigns individual receivers a set of Sequence Keys preferably at manufacture, and assigns Sequence Key Blocks (SKBs) to protected content files to be distributed. The files may be distributed on prerecorded media and typically include several file modifications. The particular modifications in a pirated version of a file can help identify which traitors contributed to its theft. SKBs assigned to new files distributed after traitors have been identified cannot be usefully processed using the compromised keys employed in previous content piracy. Innocent receivers that happen to have compromised key(s) in common with traitors can use a replacement uncompromised Sequence Key from the set to usefully decrypt content. Traitors will however step through all their Sequence Keys without reaching one that will work.