The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 19, 2022
Filed:
Feb. 09, 2018
Academy of Broadcasting Science, Nrta, Xicheng District Beijing, CN;
Beijing Novel-super Digital Tv Technology Co., Ltd, Haidian District Beijing, CN;
Sumavision Technologies Co., Ltd, Haidian District Beijing, CN;
Hisilicon Technologies Co., Ltd., Guangdong, CN;
Zhifan Sheng, Beijing, CN;
Wei Xie, Beijing, CN;
Jing Zhang, Beijing, CN;
Xuebing Tian, Beijing, CN;
Bin Xiong, Beijing, CN;
Lizheng Zheng, Beijing, CN;
Haifeng Yan, Guangdong, CN;
Zhonghua Fang, Guangdong, CN;
Qiang Wang, Beijing, CN;
Qing Yang, Beijing, CN;
Peng Chen, Beijing, CN;
Longhui Jin, Beijing, CN;
Jinglei Liu, Beijing, CN;
ACADEMY OF BROADCASTING SCIENCE, NRTA, XIcheng, CN;
BEIJING NOVEL-SUPER DIGITAL TV TECHNOLOGY CO., LTD., Haidian, CN;
SUMAVISION TECHNOLOGIES CO., LTD, Haidian, CN;
HISILICON TECHNOLOGIES CO., LTD., Longgang, unknown;
Abstract
Provided is a method for protecting an encrypted control word. The method includes: receiving a hardware security module entitlement management message and an encrypted control word transmitted from a main chip, where the hardware security module entitlement management message includes a key for decrypting the encrypted control word; decrypting, based on the hardware security module entitlement management message and a hardware security module root key stored in the hardware security module, the encrypted control word to obtain a control word; reencrypting the control word based on a re-encryption key stored in the hardware security module to obtain a reencrypted control word; and transmitting the reencrypted control word to the main chip, so that the main chip decrypts, based on a main chip entitlement management message transmitted from the front end, the reencrypted control word to obtain the control word.