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...

2007-08-14

2007-08-14

Smithers, Matthew (Department: 2137)

Electrical computers and digital processing systems: support

Multiple computer communication using cryptography

Having particular address related cryptography

C713S181000

Reexamination Certificate

active

11123751

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.

REFERENCES:
patent: 4607137 (1986-08-01), Jansen
patent: 4679236 (1987-07-01), Davies
patent: 4853962 (1989-08-01), Brockman
patent: 4878246 (1989-10-01), Pastor et al.
patent: 4972472 (1990-11-01), Brown et al.
patent: 4991087 (1991-02-01), Burkowski et al.
patent: 5081677 (1992-01-01), Green et al.
patent: 5115467 (1992-05-01), Esserman et al.
patent: 5120939 (1992-06-01), Claus et al.
patent: 5199073 (1993-03-01), Scott
patent: 5245658 (1993-09-01), Bush et al.
patent: 5297207 (1994-03-01), Degele
patent: 5351293 (1994-09-01), Michener et al.
patent: 5393062 (1995-02-01), Cember
patent: 5414771 (1995-05-01), Fawcett, Jr.
patent: 5561713 (1996-10-01), Suh
patent: 5602915 (1997-02-01), Campana et al.
patent: 5748736 (1998-05-01), Mittra
patent: 5778416 (1998-07-01), Harrison et al.
patent: 5832228 (1998-11-01), Holden et al.
patent: 5960086 (1999-09-01), Atalla
patent: 6041408 (2000-03-01), Nishioka et al.
patent: 6088449 (2000-07-01), Atalla
patent: 6148404 (2000-11-01), Yatsukawa
patent: 6195751 (2001-02-01), Caronni et al.
patent: 6275859 (2001-08-01), Wesley et al.
patent: 6330671 (2001-12-01), Aziz
patent: 6948070 (2005-09-01), Ginter et al.
patent: 4243908 (1994-06-01), None
patent: 032107 (1981-07-01), None
patent: 0447063 (1991-09-01), None
patent: 0602335 (1994-06-01), None
patent: 2223614 (1990-04-01), None
patent: A 9200876 (1993-12-01), None
patent: WO95/09498 (1995-04-01), None
patent: WO97/16902 (1997-05-01), None
McGovern, T., “Varying Encryption Keys for a Single Call,” Motorola Technical Developments, vol. 24, Mar. 1995, pp. 61-62.
Merkel, R.C., “Secure Communications Over Insecure Channels,” Communications of the ACM, vol. 21, No. 4, Apr. 1978, pp. 294-299.
Radlo, E.J., “Cryptography in Cyberspace,” New Matter, vol. 20, No. 3, Jul. 24, 1995, pp. 44-48.
Schneier, B., Applied Cryptography: protocols, algorithms, and source code in C, John Wiley & Sons, Inc., 1stEd., 1994, pp. 42-65.
Tsubakiyama, H. and Kogo, K., “Security for Information Data Broadcasting System with Conditional-Access Control,” IEEE, 1993, pp. 164-170.
Wadzinske, “Key Pointer Rekeying,” Motorola Technical Developments, vol. 25, Jul. 1995, p. 136.
U.S. Appl. No. 09/095,350, filed Jun. 9, 1998, Martin M. Atalla, Donald Adams and James E. Bennett, Inventors, now abandoned, 27 pp.

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