Encrypting received content
원문보기
IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
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출원번호 |
US-0015351
(2001-12-11)
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등록번호 |
US-8312265
(2012-11-13)
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발명자
/ 주소 |
- Pinder, Howard G.
- Hopper, Jeffrey C.
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출원인 / 주소 |
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대리인 / 주소 |
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인용정보 |
피인용 횟수 :
1 인용 특허 :
9 |
초록
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Encrypting content included in a program or service is disclosed, wherein the encrypted content is transmitted from a transmitter to a receiver in a subscriber network. Generally, in one embodiment, the encrypted program or service is packetized, and the packets are transmitted to the receiver. When
Encrypting content included in a program or service is disclosed, wherein the encrypted content is transmitted from a transmitter to a receiver in a subscriber network. Generally, in one embodiment, the encrypted program or service is packetized, and the packets are transmitted to the receiver. When a packet having ciphertext of the encrypted program or service is received at the receiver, the ciphertext of the packet is preferably converted to a different form of ciphertext.
대표청구항
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1. A method for securely storing encrypted programming received at a receiver in a subscriber television network, wherein the encrypted programming includes a plurality of ciphertext packets, the method comprising the steps of: receiving from a headend of the subscriber network a first ciphertext pa
1. A method for securely storing encrypted programming received at a receiver in a subscriber television network, wherein the encrypted programming includes a plurality of ciphertext packets, the method comprising the steps of: receiving from a headend of the subscriber network a first ciphertext packet at the receiver and a first key, a second key and a third key, wherein the first ciphertext packet has three layers of encryption thereon that were applied by a first cryptographic algorithm using the first key, the second key and the third key;generating a fourth key;applying to the first ciphertext packet a second cryptographic algorithm with the first key to convert the first ciphertext packet to a second ciphertext packet having two layers of encryption thereon without first converting the first ciphertext packet received from the headend to a cleartext packet; andapplying to the second ciphertext packet a third cryptographic algorithm with the fourth key to convert the second ciphertext packet to a third ciphertext packet having a third layer of encryption thereon without first converting the second ciphertext packet to a cleartext packet. 2. The method of claim 1, wherein the receiver is remote from the headend and located at a subscriber location; and further including the step of: storing the third ciphertext packet and the second, third and fourth keys at the subscriber location. 3. The method of claim 2, further including the steps of: retrieving the third ciphertext packet and the second, third and fourth keys from storage; anddecrypting the third ciphertext packet by applying a fourth cryptographic algorithm to third ciphertext packet with the second, third and fourth keys, thereby converting the third ciphertext packet to a cleartext packet. 4. The method of claim 3, further including the step of: converting the cleartext packet from a first format to a second format. 5. The method of claim 4, wherein the first format is an MPEG format. 6. A receiver in a subscriber cable television network that receives encrypted programming, from a headend of the subscriber cable television network, wherein the encrypted programming includes a plurality of ciphertext packets, the receiver comprising: an input port adapted to receive a first key, a second key, a third key and a first ciphertext of the encrypted programming, wherein the first ciphertext packet has three layers of encryption thereon that were applied by a first cryptographic algorithm using the first key, a second key and a third key;a key generator adapted to generate a fourth key;a cryptographic device in communication with the input port and the key generator, the cryptographic device adapted to convert the first ciphertext packet to a second ciphertext packet using a second cryptographic algorithm and the first key without first converting the first ciphertext packet received from the headend to a cleartext packet and thereafter to convert the second ciphertext packet to a third ciphertext packet using a third cryptographic algorithm and the fourth key without first converting the second ciphertext packet to a cleartext packet; anda storage device in communication with the cryptographic device adapted to store the third ciphertext packet and the second, third and fourth keys. 7. The receiver of claim 6, wherein the cryptographic device is further adapted to decrypt the third ciphertext packet by applying a fourth cryptographic algorithm to the third ciphertext packet with the second, third and fourth keys thereby converting the third ciphertext packet to a cleartext packet. 8. The receiver of claim 7, wherein the first, second and third cryptographic algorithms are a DES algorithm and the fourth cryptographic algorithm is a 3DES algorithm. 9. The receiver of claim 7, further including: a converter in communication with the cryptographic device adapted to convert the cleartext packet from a first format to a second format. 10. The receiver of claim 9, wherein the first format is an MPEG format.
이 특허에 인용된 특허 (9)
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Marshall Alan D. (Merchants Landing GB2) Mitchell Christopher J. (Warminster GB2) Proudler Graeme J. (Stoke Gifford GB2), Data authentication and protection system.
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Thompson John R. (La Quinta CA) Hunting C. J. (Altadena CA) Phipps William L. (Bermuda Dunes CA) Raynesford Steven J. (Cathedral City CA) Rittmueller Philip H. (St. Charles IL), Digital data cryptographic system.
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Zeidler Howard M. (Palo Alto CA), End-to-end encryption system and method of operation.
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Gammie Keith (Markham CAX) Yoneda Robert K. (Toronto CAX) Woo Arthur (Scarborough CAX) Sheldrick Wayne (Don Mills CAX), Independent external security module for a digitally upgradeable television signal decoder.
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Hendricks John S. (Potomac MD) Wunderlich Richard E. (Alpharetta GA), Operations center with video storage for a television program packaging and delivery system.
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Rabowsky Irving, System and method for digital electronic cinema delivery.
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Spies Terence R. ; Simon Daniel R., System and method for secure purchase and delivery of video content programs.
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Birch Christopher H.,CAX ; van Staden Christian V.,CAX ; Brooks Walter R.,CAX ; Nicholas Paul D.,CAX ; Lawrence Steven S.,CAX, System and method for transmitting a plurality of digital services including imaging services.
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Pinder Howard G. ; Palgon Michael S. ; Akins ; III Glendon L. ; Banker Robert O., Verification of the source of program information in a conditional access system.
이 특허를 인용한 특허 (1)
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Lee, Byung-Rae; Hwang, Sung-Oh; Lee, Kook-Heui, Method and system for protecting broadcast service/content in a mobile broadcast system, and method for generating short term key message therefor.
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