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Secure PKI Communications for "Machine-to-Machine" Modules, including Key Derivation by Modules and Authenticating Public Keys

  • US 20150095648A1
  • Filed: 09/27/2013
  • Published: 04/02/2015
  • Est. Priority Date: 09/10/2013
  • Status: Active Grant
First Claim
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1. A method for a module to use a public key and a private key, the method comprising the module:

  • deriving the private key and the public key using a cryptographic algorithms, wherein the module records the private key in a nonvolatile memory;

    reading (i) a module identity using a read-only address in the module, and (ii) a shared secret key from the nonvolatile memory;

    sending a first message, wherein the first message includes the public key, a set of parameters for the public key, and the module identity, and wherein the module uses the shared secret key to authenticate the first message;

    sending a second message, wherein the second message includes a module encrypted data, the module identity, and a module digital signature, wherein the module encrypted date (i) is ciphered using an asymmetric ciphering algorithm and (ii) includes a value for a symmetric key, and wherein the module digital signature is processed using the private key;

    receiving a response, wherein the response includes a server encrypted data, and wherein the server encrypted data includes a module instruction, and wherein the server encrypted data is decrypted using the symmetric key;

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