Method of securing a document in a system and controlling...

Details Method of securing a document in a system and controlling... Method of securing a document in a system and controlling...

2007-02-14

2010-06-22

Smithers, Matthew B (Department: 2437)

Electrical computers and digital processing systems: support

Multiple computer communication using cryptography

Having particular address related cryptography

C713S181000

Reexamination Certificate

active

07743249

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 to any data stream.

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