×

Updating cryptographic key pair

  • US 9,893,885 B1
  • Filed: 03/13/2015
  • Issued: 02/13/2018
  • Est. Priority Date: 03/13/2015
  • Status: Active Grant
First Claim
Patent Images

1. A system-on-chip, comprising:

  • a processor;

    an electrically erasable programmable non-volatile memory; and

    a fuse-based memory having a plurality of prime numbers stored therein, and having a plurality of indices each associated with a respective pair of prime numbers from the plurality of prime numbers, wherein the fuse-based memory includes a fuse-based structure configured to remain unchanged after being burnt;

    wherein the processor is configured to;

    retrieve a first pair of prime numbers associated with a first index of the indices from the fuse-based memory;

    derive a first private key using the first pair of prime numbers;

    use the first private key with an asymmetric cryptographic algorithm for performing cryptographic operations;

    detect a trigger event for generating a new cryptographic key;

    in response to the detected trigger event, retrieve a second pair of prime numbers associated with a second index of the indices from the fuse-based memory, and derive a second private key for the asymmetric cryptographic algorithm as a new cryptographic key, using the second pair of prime numbers; and

    use the second private key for performing additional cryptographic operations.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×