Global Patent Index - EP 1050132 A1

EP 1050132 A1 2000-11-08 - METHOD AND APPARATUS FOR CONVEYING A PRIVATE MESSAGE TO SELECTED MEMBERS

Title (en)

METHOD AND APPARATUS FOR CONVEYING A PRIVATE MESSAGE TO SELECTED MEMBERS

Title (de)

VERFAHREN UND VORRICHTUNG ZUR ÜBERTRAGUNG EINER VERTRAULICHEN NACHRICHT AN AUSGEWÄHLTE TEILNEHMER

Title (fr)

PROCEDE ET APPAREIL D'ENVOI D'UN MESSAGE PRIVE A DES MEMBRES SELECTIONNES

Publication

EP 1050132 A1 (EN)

Application

EP 99908068 A

Priority

  • US 9900896 W
  • US 7177698 P

Abstract (en)

[origin: WO9937052A1] An encrypted broadcast messaging system (102, 103) determines the management crypto-keys held by each selected subscriber (101) device and not held by each excluded subscriber device of a group. The private message is decomposed into message-parts, one message-part per an excluded subscriber device, each message-part intended to be encrypted using each management crypto-key held by the selected subscriber devices (101) and not held by the excluded subscriber device. Each message-part is encrypted using the management crypto-keys, and delivered to at least the selected subscriber devices, identifying the message-parts delivered and the message-parts necessary to re-compose the private message. Each received encrypted message-parts necessary to re-compose the private message. Each received encrypted message-part is decrypted using the intended management crypto-key, and the necessary message-parts are chosen from which the private message is re-composed by combining in the selected subscriber device (101).

IPC 1-7 (main, further and additional classification)

H04L 9/00

IPC 8 full level (invention and additional information)

H04L 9/00 (2006.01); H04L 9/08 (2006.01); H04L 9/14 (2006.01); H04L 12/22 (2006.01); H04N 7/16 (2011.01); H04N 7/167 (2011.01); H04W 12/00 (2009.01)

CPC (invention and additional information)

H04N 7/162 (2013.01); H04L 9/0827 (2013.01); H04L 9/0833 (2013.01); H04N 7/1675 (2013.01); H04N 21/26606 (2013.01); H04N 21/4623 (2013.01); H04W 12/02 (2013.01); H04W 12/04 (2013.01); H04L 2209/601 (2013.01)

Designated contracting state (EPC)

AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

EPO simple patent family

WO 9937052 A1 19990722; AU 2758699 A 19990802; AU 750042 B2 20020711; BR 9907094 A 20001024; CA 2318452 A1 19990722; CN 1292185 A 20010418; EP 1050132 A1 20001108; EP 1050132 A4 20050518; JP 2002510164 A 20020402; NO 20003651 A 20000918; NO 20003651 D0 20000717

INPADOC legal status


2007-01-10 [18D] DEEMED TO BE WITHDRAWN

- Effective date: 20060613

2005-05-18 [A4] SUPPLEMENTARY SEARCH REPORT

- Effective date: 20050406

2000-11-08 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20000808

2000-11-08 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE