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Secure feature and key management in integrated circuits

  • US 10,084,771 B2
  • Filed: 09/30/2015
  • Issued: 09/25/2018
  • Est. Priority Date: 08/10/2012
  • Status: Active Grant
First Claim
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1. A method comprising:

  • receiving, by a root authority system, data identifying a command that, when executed by a security manager core of an integrated circuit, enables the security manager core to update a functionality of a hardware feature of the integrated circuit, a command template that designates content, form, or both of a delegate signing block (DSB) for a delegate authority system, and delegate permissions associated with the delegate authority system;

    signing, by the root authority system, the command using a root authority key to create a root signed block (RSB), the RSB comprising a signature signed by the root authority key, a delegate public key associated with the delegate authority system, and the data identifying the command, the command template, and the delegate permissions; and

    providing the RSB to the security manager core of the integrated circuit, wherein the command, in response to the signature of the RSB being verified by the security manager core, is executed by the security manager core to enable the security manager core to update the functionality of the hardware feature.

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