公开(公告)号：US20180359090A1

公开(公告)日：2018-12-13

申请号：US15618103

申请日：2017-06-08

Applicant: QUALCOMM Incorporated

Inventor： Ashish GROVER ,  Shivaprasad HONGAL ,  Bollapragada V.J. MANOHAR

IPC: H04L9/32 ,  H04L29/06 ,  H04L9/06 ,  H04L9/08 ,  H04L9/14

CPC classification number: H04L9/32 ,  H04L9/0631 ,  H04L9/0894 ,  H04L9/14 ,  H04L63/0428 ,  H04N21/26606 ,  H04N21/4181 ,  H04N21/42623 ,  H04N21/4405

Abstract: Techniques for operating a receiver are provided. An example method according to these techniques includes receiving a content type indicator from a transmitter indicating that a content stream from the transmitter comprises a first content type, performing a first integrity check on the content stream by decrypting content from the content stream based in part on the content type indicator, incrementing a counter responsive to the first integrity check failing due to a mismatch between the content type indicator and the content of the content stream, performing a second integrity check on the content stream by decrypting the content from the content stream based in part on a second content type responsive to the counter exceeding a threshold, and decrypting the content stream based in part on the second integrity check being successful.

公开(公告)号：US20180359539A1

公开(公告)日：2018-12-13

申请号：US15618108

申请日：2017-06-08

Applicant: QUALCOMM Incorporated

Inventor： Shivaprasad HONGAL ,  Ashish GROVER ,  Bollapragada V.J. MANOHAR

IPC: H04N21/643 ,  H04N21/2347 ,  H04N21/24

CPC classification number: H04N21/643 ,  G06F21/10 ,  H04N21/2347 ,  H04N21/2402 ,  H04N21/43635 ,  H04N21/4367 ,  H04N21/4408

Abstract: Techniques for operating a transmitter are provided. An example method for transmitting protected digital content from a transmitter to a receiver according to those techniques includes determining whether the receiver is compliant with a version of a content protection protocol, sending, to the receiver, a content type indicator indicating that the digital content comprises a first content type regardless of whether the digital content actually comprises the first content type responsive to the receiver being compliant with the version of the content protection protocol, and transmitting the digital content to the receiver.

公开(公告)号：US20200082088A1

公开(公告)日：2020-03-12

申请号：US16127730

申请日：2018-09-11

Applicant: QUALCOMM Incorporated

Inventor： Baranidharan MUTHUKUMARAN ,  Ivan MCLEAN ,  Bollapragada V.J. MANOHAR ,  Vincent Pierre LE ROY ,  Ashish GROVER

IPC: G06F21/57 ,  G06F21/60 ,  H04L9/08 ,  H04L9/32

Abstract: Various embodiments include methods and devices for implementing protection of data by preventing non-authorized firmware modification on a computing device. Embodiments may include measuring, by a software program, an image of a firmware update producing a measurement of the image of the firmware update, modifying a version identifier of a prior installed firmware producing a version identifier of the firmware update, applying a root key generation algorithm to the measurement of the image of the firmware update, the version identifier of the firmware update, and an enroll identity credential, generating an enroll encryption root key as an output of the root key generation algorithm, applying a seed key encryption algorithm to the enroll encryption root key and an enroll encryption seed key, and generating a sealed encryption seed key as an output of the seed key encryption algorithm.