Methods and device for secure transfer of symmetric encryption keys

A device for secure transfer of symmetric encryption keys, the method comprising:

• means for 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;
• means for encrypting the set of symmetric encryption keys, included in the second KMM, using the first key encryption key;
• means for 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;
• means for encrypting the second KMM using the KMM encryption key to generate an encrypted second KMM;
• and
• means for 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;
• further comprising the sending device digitally signing at least one of the first KMM or the encrypted second KMM before sending the first KMM and the encrypted second KMM to the receiving device;
• further comprising:
• means for generating a random encrypting key;
• and
• means for encrypting at least one of the first KMM or the encrypted second KMM using the random encrypting key before sending the first KMM and the encrypted second KMM to the receiving device;
• further comprising:
• means for encrypting the random encrypting key using a second public key of the receiving device to generate an encrypted random encrypting key;
• and
• means for appending the encrypted random encrypting key to the at least one of the first KMM or the encrypted second KMM before sending the first KMM and the encrypted second KMM to the receiving device.