Key exchange method and apparatus
First Claim
1. A method of key exchange, wherein a device to device (D2D) link is established between a first user equipment and a second user equipment, and the method comprises:
- acquiring, by the first user equipment, a second key, wherein the second key is shared by a network device and the first user equipment;
generating, by the first user equipment, a first key according to the second key and a first parameter by using a key derivation function, wherein the first parameter comprises a random number generated by the network device; and
transmitting, by the first user equipment, the first key to the second user equipment;
protecting, by the first user equipment, communication information transmitted on the D2D link by using the first key.
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Abstract
Embodiments of the present invention disclose a key exchange method and apparatus, which relate to the communications field, and can enable user equipments establishing a D2D link to share a set of keys, and further, information security can be achieved when a user equipment transmits service data or a signaling message through a Ud interface. A network device acquires a first key, and sends a message including the first key to a second user equipment, so that the second user equipment uses, when communicating with a first user equipment by using a D2D link, the first key to protect transmitted information. Embodiments of the present invention are applicable to an exchange process of keys for protecting data on a D2D link.
4 Citations
14 Claims
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1. A method of key exchange, wherein a device to device (D2D) link is established between a first user equipment and a second user equipment, and the method comprises:
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acquiring, by the first user equipment, a second key, wherein the second key is shared by a network device and the first user equipment; generating, by the first user equipment, a first key according to the second key and a first parameter by using a key derivation function, wherein the first parameter comprises a random number generated by the network device; and transmitting, by the first user equipment, the first key to the second user equipment; protecting, by the first user equipment, communication information transmitted on the D2D link by using the first key. - View Dependent Claims (2, 3, 4)
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5. An apparatus, wherein a device to device (D2D) link is established between a first user equipment and a second user equipment, and the apparatus comprises:
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a processor, configured to acquire a second key, wherein the second key is shared by a network device and the first user equipment, and generate a first key according to the second key and a first parameter by using a key derivation function, wherein the first parameter comprises a random number generated by the network device; and a transmitter, configured to send a message comprising the first key to the first user equipment and the second user equipment for protecting communication information transmitted on the D2D link by using the first key when the second user equipment communicates with the first user equipment by using the D2D link. - View Dependent Claims (6, 7, 8, 9, 10)
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11. An apparatus of a first user equipment, wherein a device to device (D2D) link is established between the first user equipment and a second user equipment, and the apparatus comprises:
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a processor, configured to acquire a second key, wherein the second key is shared by a network device and the first user equipment, and generate a first key according to the second key and a first parameter by using a key derivation function, wherein the first parameter comprises a random number generated by the network device, and a transmitter, configured to transmit the first key to the second user equipment; wherein the processor is further configured to protect transmitted communication information transmitted on the D2D link by using the first key. - View Dependent Claims (12, 13, 14)
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Specification