Meunier Carlin & Curfman LLC
Method for protecting encrypted control word, hardware security module, main chip and terminal
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.
BEIJING NOVEL-SUPER DIGITAL TV TECHNOLOGY CO., LTD. ACADEMY OF BROADCASTING SCIENCE, NRTA HISILICON TECHNOLOGIES CO., LTD. SUMAVISION TECHNOLOGIES CO., LTD
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Zhonghua Xuebing Wei Zhifan Longhui Jing Lizheng Bin Peng Qing Qiang Haifeng Jinglei
Fang Tian Xie Sheng Jin Zhang Zheng Xiong Chen Yang Wang Yan Liu