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hardware receiver device

A receiver and hardware technology, applied in the direction of secure communication devices, synchronous sending/receiving encryption equipment, electrical components, etc., can solve problems such as not synchronizing passwords, not being able to decrypt content data, and being unprepared

Active Publication Date: 2019-11-19
SYNOPSYS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] If the sender does not wait 200ms after sending the encrypted session key but starts sending encrypted content immediately before, during, or immediately after SKE (Session Key Exchange), the receiver 100 may not be prepared or ready to listen to the ENC_EN=1 control signal, and the receiver 100 may not synchronize the cipher and thus not be able to decrypt the content data

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Embodiment Construction

[0018] refer to figure 2 , in one embodiment, to ensure correct cryptographic synchronization, upon detection of the ENC-EN control signal 102a, the receiver 200 starts frame counting 201 before establishing SKE (or in the pre-authorization or PRE-AUTH state). The SKE exchange occurs when the transmitter (Tx) sends the encrypted session key to the receiver (Rx). An example of a session key is a random, secret key negotiated between the HDCP transmitter (Tx) and HDCP receiver (Rx) 200 during a session key exchange (SKE) and used during HDCP content encryption or decryption. HDCP content includes audiovisual content (including in encrypted form) that is protected by the HDCP system and transmitted from an HDCP sender to a downstream sink device (e.g., HDCP receiver 200) over an HDCP-protected interface, such as HDMI. ). Scenarios for HDCP systems are included in figure 2 The HDCP transmitter (Tx) and HDCP receiver (Rx) 200 shown in FIG. HDCP Receiver (Rx) 200 is a device t...

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Abstract

An HDCP receiver device that receives frames from an HDCP transmitter device. The receiver device has a frame counter that is updated for each frame that is received from the transmitter device and that includes encrypted content, while the receiver device is in a pre- authorization mode. During the pre-authorization mode, the receiver device does not decrypt any received frame bearing encrypted content. While the receiver device waits to transition from the pre-authorization mode to a post-authorization mode in which the receiver device can begin to decrypt any received frames that include encrypted content, the frame counter is updated for each frame received that includes encrypted content. In the post-authorization mode, the frame counter has a nonzero value if frames including encrypted content were received by the receiver device during the pre-authorization mode.

Description

technical field [0001] The present invention relates to the field of synchronization of content encryption engines for HDCP over HDMI. Background technique [0002] Revision 2.2 of the specification for High-bandwidth Digital Content Protection (HDCP) over High-Definition Multimedia Interface (HDMI) was released in February 2013. When establishing an HDCP HDMI transport, a Session Key Exchange (SKE) is performed. [0003] An HDCP system consists of a source device, one or more sink devices and / or one or more repeater devices. The source device is an HDCP transmitter that encrypts video / audio content according to the HDCP HDMI Revision 2.2 specification. The receiving device is an HDCP receiver that decrypts video / audio content according to this specification. Repeater devices are HDCP repeaters that can decrypt and re-encrypt video / audio content according to this specification. In this article, we will only consider HDCP transmitters and HDCP receivers, but the same basi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L9/12H04L9/32H04N21/4627
CPCH04L9/12H04L9/3263H04N21/43632H04N21/44008H04N21/4405H04N21/4623
Inventor 安德鲁·A·埃利亚斯A.A.·吉特拉·阿迪卡里
Owner SYNOPSYS INC