Method of securing a document in a system and controlling access to the document and a seal for use in the method
US7743249B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 14, 2007 |
| Grant date | Jun 22, 2010 |
| Priority date | — |
| Expiry date | Oct 15, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L9/083
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
An efficient multicast key management is achieved by using seals. A security server generates a seal. In one embodiment, the seal contains a key. In another embodiment, the seal contains information for generating a key. An application server requests the seal from the security server and broadcasts the seal to a plurality of recipients. A recipient wishing to encrypt or decrypt a data stream transmits the received seal to the security server to be opened. If the recipient is authorized, the security server transmits a permit to the authorized recipient. In one embodiment, the recipient generates a key from the permit. In another embodiment, the permit is the key. If the recipient is a sender, the recipient encrypts data using the key and broadcasts the same encrypted data stream to all receivers. If the recipient is a receiver, the recipient decrypts an encrypted data stream using the key. In one embodiment, a seal with a corresponding offset value is sent periodically in a data stream. In another embodiment, multiple instances of identical seals are opened only once. In yet another embodiment, a seal is appended to each datagram packet. In a further embodiment, a seal is appended…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.