Hisilicon Technologies Co., Ltd.

Beijing Novel-super Digital Tv Technology Co., Ltd.

Academy of Broadcasting Science, Nrta

Sumavision Technologies Co., Ltd

Xuebing Tian

Qiang Wang

Peng Chen

Lei Zhang

Wei Xie

Qing Yang

Jinglei Liu

Zhifan Sheng

Bin Xiong

Haifeng Yan

Zhonghua Fang

Longhui Jin

Lizheng Zheng

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.

Method for protecting encrypted control word, hardware security module, main chip and terminal

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Beijing, China

Xuebing Tian