Intel Corporation

David A Lee

Gary L Graunke

Robert W Faber

Brendan Traw

Hormuzd M Khosravi

David Wyatt

Richard Paul Mangold

C Brendan Traw

Raji Srinivasa Raghavan

Raji Srinvasa Raghavan

A content processing integrated circuit includes a system-on-a-chip (SoC) that further includes a processor to receive an authentication request from an external device for authenticating if the SoC is permitted to receive encrypted content from the external device, and to receive the encrypted content once the SoC is authenticated. An authentication processor is provided and coupled to the processor to authenticate the SoC to the external device when the processor receives the authentication request, and to generate a decryption key for decrypting the encrypted content. A decryption processor is provided and coupled to the processor and the authentication processor to receive the decryption key from the authentication processor and to decrypt the encrypted content with the decryption key. A wireless display system with such SoC is also described. A method of implementing a secure and robust content protection in a SoC is also described.

Implementation of robust and secure content protection in a system-on-a-chip apparatus

In a cryptographic system, a nonce is removed from a communication stream. The nonce is encrypted based on a shared secret. The encrypted nonce is inserted into the communication stream. The encrypted nonce is removed from the communication stream. The encrypted nonce is decrypted based on the shared secret formed by an authenticated key exchange. The decrypted nonce is inserted into the communication stream. The nonce may be an Avalue generated by a HDCP function. The authenticated key exchange may use Diffie-Hellman Key Exchange.

Method and apparatus for augmenting authentication in a cryptographic system

A video source device includes a cipher unit. The video source device uses the cipher unit to generate cipher bits for ciphering video to be transmitted to protect the video from unauthorized copying. The video source device authenticates video receiving devices using a symmetric ciphering/deciphering process that requires the video source device to generate and provide the video receiving device with a pseudo random number as the seed/basis number for the symmetric ciphering/deciphering process. The video source device is further provided with a state machine that controls the cipher unit to generate the required pseudo random number for the video source devices, thereby eliminating the need of having to provide separate circuitry to generate the required pseudo random numbers.

Method and apparatus for generating pseudo random numbers in a video device having an embedded cipher unit

A method for formation of a shared secret key using a key matrix and a corresponding authentication protocol are described. The shared secret key formation scheme is a method in which sets of secret device keys are formed from arithmetic operations on matrix keys of a key matrix. The contents of the key matrix are held in confidence by the certification authority. The selection of which matrix keys to use is based on a key selection vector assigned by the certification authority. From the secret device keys, a shared secret key may be formed in accordance with a selected authentication protocol.

Method and apparatus for the generation of cryptographic keys

A method and apparatus for increasing the entropy of a pseudorandom number (PRN). An intervener unit receives one or more signals from an authenticating device during a false authentication attempt. The intervener unit generates, in response to the one or more signals, a first PRN with an associated level of entropy, and transmits the first PRN to the authenticating device. The entropy level of the first PRN causes the authenticating device to generate during a subsequent authentication attempt a second PRN with a greater level of entropy than the first PRN.

Method and apparatus for increasing the entropy of a pseudorandom number

A method and apparatus for determining the scope of a content domain for ensuring that a content stream is not re-routed to an unauthorized display device. The apparatus includes a content source device, which supports multiple display outputs coupled to one or more content sink devices. A content source application generates and provides a content stream to a hardware interface which securely transmits the content stream to a protected content sink device using a content protection protocol. The content source application utilizes certain status information to ensure that the content stream is not re-routed to an unprotected or unapproved content sink device. The source application requests the updated session identification code from the transmitter/codec unit using the content protection protocol which is compared against the expected session identification code to ensure that the content display stream has not been re-routed to an unprotected content sink device.

Method and apparatus for determining scope of content domain

A dual use block/stream cipher is provided with a first key section and a data section. The first key section is to be initialized with a first cipher key, and to successively transform the first cipher key or a modified version of the first cipher key. The data section, coupled to the first key section, is to be initialized with either a block of plain text or a random number, and to successively and dependently, on the first key section, transform the plain text/random number. The cipher is further provided with a second key section and a mapping function. The second key section, coupled to the first key section, is selectively enableable to modify the first cipher key. The mapping section, coupled to the first key section, is to generate a pseudo random bit sequence when the second key section is selectably enabled to modify the stored first cipher key.

Dual use block/stream cipher

A video source device generates a session key for each transmission session wherein a multi-frame video content is to be transmitted to a video sink device. The video source device uses the session key to generate a successive number of frame keys. The frame keys in turn are used to generate corresponding pseudo random bit sequences for ciphering the corresponding frames to protect the video content from unauthorized copying during transmission. The video sink device practices a complementary approach to decipher the received video content. In one embodiment, both devices are each provided with an integrated block/stream cipher to practice the transmission protection method.

Digital video content transmission ciphering and deciphering method and apparatus

A video source device and a video repeater device cooperatively authenticates said video repeater apparatus to said video source device. In one embodiment, the authentication is performed using an identical authentication process a video sink device would authenticate itself to the video source device. The video repeater device augment the identical process identifying itself as a repeater device. The video repeater device also in cooperation with at least one video sink device authenticates the at least one video sink device. The video repeater device in turn, in cooperation with the video source device, authenticates the at least one video sink device to the video source device. In one embodiment, the video repeater device also in cooperation with another video repeater device, authenticates yet another at least one video sink device to the video repeater device. In like manner, the video repeater device, in cooperation with the video source device, authenticates the yet another at least one video sink device to the video source device. In one embodiment, the video repeater device includes topological information of the video sink devices among the authentication information provided to the video source device. Accordingly, video sink devices may be hierarchically organized to the video source device.

Method and apparatus for authenticating an hierarchy of video receiving devices

A stream cipher is provided with one or more data bit generators to generate a first, second and third set of data bits. The stream cipher is further provided with a combiner function having a network of shuffle units to combine the third set of data bits, using the first and second sets of data bits as first input data bits and control signals respectively of the network of shuffle units. In one embodiment, the shuffle units are binary shuffle units and they are serially coupled to one another.

Stream cipher having a shuffle network combiner function

A video source application in a video source device requests from a video hardware interface of the video source device status with respect to a link linking the video source device to an external video sink device, and supplements the status request with a first basis value to a symmetric ciphering/deciphering process. The video source application, upon receiving from the video hardware interface the requested status and a verification key, generated using said symmetric ciphering/deciphering process and employing the first basis value, verifies the correctness of the verification key to determine whether to trust said provided status. In like manner, the video source application requests from the video hardware interface a secret the video hardware interface uses to cipher video to be transmitted by the video hardware interface to the external video sink device. The secret request is supplemented with a second basis value to the symmetric ciphering/deciphering process. The secret is returned in a cipher form, ciphered using a ciphering key generated using the second basis value. The video source application deciphers the secret using its own independently generated copy of the ciphering key.

Method and apparatus for protected exchange of status and secret values between a video source application and a video hardware interface

A video source device provides a basis value to a symmetric ciphering/deciphering process to a video sink device, to which the video source device is to provide a video content. The video source device ciphers the video content for transmission to the video sink device, including generation of a first cipher key through functional transformation of the basis value. The video source device further verifies periodically that the transmitted video content is indeed being symmetrically deciphered by the video sink device. The video sink device practices symmetric deciphering, including generation of a first decipher key through functional transformation of the basis value. The video sink device also provides verification values to the video source device to facilitate confirmation of symmetric deciphering. In one embodiment, the video source and sink devices further authenticate each other, including generation of an authentication key, which is used in the generation of the first cipher/decipher key.

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Beaverton, OR, United States of America

David A Lee