Methods and device for secure transfer of symmetric encryption keys
First Claim
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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Accused Products
Abstract
A sending device generates a first and a second KMM, wherein the first KMM includes a first KEK and a KMM encryption key, and the second KMM includes a set of symmetric encryption keys. The sending device further encrypts the set of symmetric encryption keys using the first KEK; encrypts the first KEK and the KMM encryption key using a first public key of a receiving device; and encrypts the second KMM using the KMM encryption key to generate an encrypted second KMM before sending the first KMM and the encrypted second KMM to the receiving device. The receiving device decrypts the first KEK and the KMM encryption key using a first private key that corresponds to the first public key; and decrypts the encrypted second KMM using the KMM encryption key to obtain the encrypted set of symmetric keys.
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Citations
7 Claims
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1. A method for secure transfer of symmetric encryption keys, the method comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A device for secure transfer of symmetric encryption keys, the method comprising:
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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.
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Specification