USB interface for performing transport I/O
Systems and methods for implementing a Transport I/O system are described. Network encrypted content may be received by a device. The device may provide the network encrypted content to a secure processor, such as, for example, a smart card. The secure processor obtains a network control word that may be used to decrypt the network encrypted content. The secure processor may decrypt the network encrypted content to produce clear content. In embodiments, the secure processor may then use a local control word to generate locally encrypted content specific to the device. The device may then receive the locally encrypted content from the secure processor and proceed to decrypt the locally encrypted content using a shared local encryption key. The secure processor may connect to the device via a standard connection, such as via a USB 3.0 connector.
1. A removable security device for performing a method
comprising:
receiving a first network encrypted elementary stream, wherein the first network encrypted elementary stream is received in a format in accordance with a first clock recovery mechanism;
receiving a second network encrypted elementary stream, wherein the second network encrypted elementary stream is received in a format in accordance with the first clock recovery mechanism;
decrypting the first and second network encrypted elementary streams using at least one network control word to generate first and second clear content streams, wherein decrypting the first and second network encrypted elementary streams is based at least in part on the first clock recovery mechanism;
obtaining at least one local control word;
encrypting the first and second clear content streams to produce first and second locally encrypted content streams, wherein the first and second locally encrypted content streams are generated using the at least one local control word;
multiplexing the first and second locally encrypted content streams into an output stream;
providing, to a video processing device, the output stream, wherein the output stream is provided in accordance with the first clock recovery mechanism.
2. The removable security device of claim 1 , wherein the removable security device is a smartchip.
3. The removable security device of claim 1 , wherein the removable security device comprises a USB 3.0 connector.
4. The removable security device of claim 3 , wherein the method further comprises:
configuring a Receive− pin as an SC_out− interface;
configuring a Receive+ pin as an SC_out+ interface;
configuring a Transmit− pin as an SC_IN− interface; and
configuring a Transmit+ pin as an SC_IN+ interface.
5. The removable security device of claim 1 , wherein encrypting the first and second clear content streams utilizes a transport mode encryption.
6. The removable security device of claim 1 , wherein encrypting the first and second clear content streams utilizes a bulk mode encryption.
7. The removable security device of claim 1 , wherein the removable security device and the video processing device communicate using LVDS.
8. The removable security device of claim 1 , wherein the at least one local control word is generated by the removable security device.
9. The removable security device of claim 1 , further comprising:
obtaining a first local control word, wherein the first clear content stream is encrypted using the first local control word; and
obtaining optional additional local control word(s), wherein optional additional network content stream(s) are encrypted using the optional additional local control word(s), and wherein some or all of the local control words are different.
10. A computer storage medium not consisting of a propagated data signal encoding computer executable instructions that, when executed by at least one processor, perform a method comprising:
receiving a first network encrypted elementary stream, wherein the first network encrypted elementary stream is in a format in accordance with a first clock recovery data;
receiving a second network encrypted elementary stream, wherein the second network encrypted elementary stream is in a format in accordance with a second clock recovery data;
decrypting the first and second network encrypted elementary streams using at least one network control word to generate first and second clear content streams, wherein decrypting the first and second network encrypted elementary streams is based at least in part on the first and second clock recovery data;
obtaining at least one local control word;
encrypting the first and second clear content streams to produce first and second locally encrypted content streams, wherein the first and second locally encrypted content streams are generated using the at least one local control word;
multiplexing the first and second locally encrypted content streams into an output stream;
adding third clock recovery data to the output stream; and
providing, to a video processing device, the output stream.
11. The computer storage medium of claim 10 , wherein a first network control word is used to decrypt the first network encrypted elementary stream using the first clock recovery data and second network control word is used to decrypt the second network encrypted elementary stream using the second clock recovery data, and wherein the first and second network control words are different.
12. The computer storage medium of claim 10 , wherein the at least one local control word is generated by the removable security device.
13. The computer storage medium of claim 10 , wherein the method further comprises:
obtaining a first local control word, wherein the first clear content stream is encrypted using the first local control word; and
obtaining optional additional local control word(s), wherein optional additional network content stream(s) are encrypted using the optional additional local control word(s), and wherein some or all of the local control words are different.
14. The computer storage medium of claim 10 , wherein the output stream is provided via a connector.
15. The computer storage medium of claim 14 , wherein the connector is a USB 3.0 connector.
16. The removable security device of claim 1 , wherein the first clock recovery mechanism comprises at least one of: phase-locked looping, 8B/10B encoding and eight-to-fourteen modulation.
17. The removable security device of claim 1 , wherein the method further comprises:
adding clock recovery data to at least one of the first and second locally encrypted content streams.
18. The removable security device of claim 17 , wherein a data type of the added clock recovery data is based on a mechanism type of the first clock recovery mechanism.
19. A method of performing content decryption, the method comprising:
receiving a first network encrypted elementary stream, wherein the first network encrypted elementary stream is received is in a format in accordance with a first clock recovery mechanism;
receiving a second network encrypted elementary stream, wherein the second network encrypted elementary stream is received is in a format in accordance with the first clock recovery mechanism;
decrypting the first and second network encrypted elementary streams using at least one network control word to generate first and second clear content streams, wherein decrypting the first and second network encrypted elementary streams is based at least in part on the first clock recovery mechanism;
obtaining at least one local control word;
encrypting the first and second clear content streams to produce first and second locally encrypted content streams, wherein the first and second locally encrypted content streams are generated using the at least one local control word;
multiplexing the first and second locally encrypted content streams into an output stream;
providing, to a video processing device, the output stream, wherein the output stream is provided in accordance with the first clock recovery mechanism.
20. The method of claim 19 , wherein the first network encrypted elementary stream comprises first clock recovery data and the second network encrypted elementary stream comprises second clock recovery data.