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Methods and device for secure transfer of symmetric encryption keys

  • US 8,509,448 B2
  • Filed: 07/29/2009
  • Issued: 08/13/2013
  • Est. Priority Date: 07/29/2009
  • Status: Active Grant
First Claim
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1. A method for secure transfer of symmetric encryption keys, the method comprising:

  • at a sending device;

    generating a first and a second key management message (KMM), wherein the first KMM includes a first key encryption key and a KMM encryption key, and the second KMM includes a set of symmetric encryption keys;

    encrypting the set of symmetric encryption keys, included in the second KMM, using the first key encryption key;

    encrypting the first key encryption key and the KMM encryption key, included in the first KMM, using a first public key of a receiving device;

    encrypting the second KMM using the KMM encryption key to generate an encrypted second KMM; and

    sending the first KMM and the encrypted second KMM to the receiving device;

    wherein the first key encryption key and the KMM encryption key are the same key;

    wherein the first KMM and the encrypted second KMM is sent to the receiving device in one combined KMM;

    further comprising the sending device digitally signing the combined KMM before sending the combined KMM to the receiving device;

    further comprising;

    at the sending device;

    generating a random encrypting key; and

    encrypting the combined KMM using the random encrypting key before sending the combined KMM to the receiving device;

    further comprising;

    encrypting the random encrypting key using a second public key of the receiving device to generate an encrypted random encrypting key; and

    appending the encrypted random encrypting key to the combined KMM before sending the combined KMM to the receiving device.

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