| Title of Invention | PROCESS FOR MANAGING A SYMMETRIC KEY IN A COMMUNICATION NETWORK AND COMMUNICATION DEVICES FOR THE IMPLEMENTATION OF THIS PROCESS |
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| Abstract | The communication network comprises a device of a first type (1) furnished with a source of data to be broadcast over the network and at least one device of a second type (2) intended to receive the said data. The symmetric key management process comprises the following steps: - the source device (1) determines a first symmetric key (Kc) and transmits it securely (E1{PUB2}(Kc)) to at least one receiver device (2); - a receiver device (2) receives the first symmetric key (Kc), encrypts it (E2) with the aid of a second symmetric key (Kn), known to the receiver devices (2) of the network and transmits it to the source device; - the source device (1) recovers the encryption (E2{Kn}(Kc)) of the first symmetric key (Kc) and stores it. Before transmitting the data (CW) to at least one reception device (2), the source device (1) encrypts (E3) these data with the aid of the first symmetric key (KC), then it transmits these encrypted data (E3{Kc}{CW)), accompanied by the first encrypted symmetric key (E2{Kn}(Kç)), to at least one receiver device (2). The receiver device (2) decrypts the first symmetric key (Kc) with the aid of the second key (Kn) which it possesses, then it decrypts the encrypted data with the aid of the first symmetric key thus recovered. The invention also pertains to devices for implementing the process. |
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216-cal-2002-granted-abstract.pdf
216-cal-2002-granted-claims.pdf
216-cal-2002-granted-correspondence.pdf
216-cal-2002-granted-description (complete).pdf
216-cal-2002-granted-drawings.pdf
216-cal-2002-granted-examination report.pdf
216-cal-2002-granted-form 1.pdf
216-cal-2002-granted-form 18.pdf
216-cal-2002-granted-form 2.pdf
216-cal-2002-granted-form 26.pdf
216-cal-2002-granted-form 3.pdf
216-cal-2002-granted-form 5.pdf
216-cal-2002-granted-letter patent.pdf
216-cal-2002-granted-reply to examination report.pdf
216-cal-2002-granted-translated copy of priority document.pdf
| Patent Number | 222027 | ||||||||||||
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| Indian Patent Application Number | 216/CAL/2002 | ||||||||||||
| PG Journal Number | 29/2008 | ||||||||||||
| Publication Date | 18-Jul-2008 | ||||||||||||
| Grant Date | 16-Jul-2008 | ||||||||||||
| Date of Filing | 17-Apr-2002 | ||||||||||||
| Name of Patentee | THOMSON LICENSING, S.A. | ||||||||||||
| Applicant Address | 46 QUAI A.LE GALLO, F-92100 BOULOGNE-BILLANCOURT | ||||||||||||
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| PCT International Classification Number | N/A | ||||||||||||
| PCT International Application Number | N/A | ||||||||||||
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