Mutual authentication and re-authentication method between wireless power transmitting device and wireless power receiving device, and wireless power transmitting device and wireless power receiving device using same

Patent metadata

Field	Value
Publication number	US-2022263819-A1
Application number	US-202017626282-A
Country	US
Kind code	A1
Filing date	Jul 13, 2020
Priority date	Jul 12, 2019
Publication date	Aug 18, 2022
Grant date	—

Abstract

According to one embodiment of the present specification, a method for performing authentication between an authentication initiator and an authentication responder in a wireless power transmission system comprises the steps in which: the authentication initiator transmits an initiator certificate chain and an initiator signature to the authentication responder; the authentication initiator receives a responder certificate chain and a responder signature from the authentication responder who has authenticated the authentication initiator by verifying the initiator signature information; and the authentication initiator verifies the responder signature to authenticate the authentication responder.

First claim

1 . A method for performing mutual authentication between an authentication initiator and an authentication responder in a wireless power transfer system, the method comprising:
transmitting, by an authentication initiator, an initiator certificate chain and an initiator signature to an authentication responder; receiving, by the authentication initiator, a responder certificate chain and a responder signature from the authentication responder which has authenticated the authentication initiator by verifying the initiator signature; and authenticating, by the authentication initiator, the authentication responder by verifying the responder signature.

2 . The method of claim 1 , wherein the initiator signature is generated with a private key,
wherein the initiator certificate chain includes a public key, and wherein the authentication responder verifies the initiator signature using the public key.

3 . The method of claim 1 , wherein the responder signature is generated with a private key,
wherein the responder certificate chain includes a public key, and wherein the authentication initiator verifies the responder signature using the public key.

4 . The method of claim 1 , wherein the authentication initiator transmits an initiator public key along with the initiator certificate chain and the initiator signature to the authentication responder and receives a responder public key along with the responder certificate chain and the responder signature from the authentication responder;
wherein the method further comprising: generating, by the authentication initiator, an initiator symmetric key using the responder public key.

5 . The method of claim 4 , wherein the authentication responder generates a responder symmetric key identical to the initiator symmetric key by using the initiator public key.

6 . The method of claim 4 , wherein, after the initiator symmetric key is generated, the authentication initiator authenticates the authentication responder using the initiator symmetric key with the authentication responder.

7 . The method of claim 1 , wherein the authentication initiator is a wireless power transmitter that transmits wireless power, and the authentication responder is a wireless power receiver that receives the wireless power.

8 . The method of claim 1 , wherein the authentication responder is a wireless power transmitter that transmits wireless power, and the authentication initiator is a wireless power receiver that receives the wireless power.

9 . A method for performing mutual authentication between an authentication initiator and an authentication responder in a wireless power transfer system, the method comprising:
receiving, by an authentication responder, an initiator certificate chain and an initiator signature from an authentication initiator; authenticating, by the authentication responder, the authentication initiator by verifying the initiator signature; and transmitting, by the authentication responder, a responder certificate chain and a responder signature to the authentication initiator.

10 . The method of claim 9 , wherein the initiator signature is generated with a private key,
wherein the initiator certificate chain includes a public key, and wherein the authentication responder verifies the initiator signature using the public key.

11 . The method of claim 9 , wherein the responder signature is generated with a private key,
wherein the responder certificate chain includes a public key, and wherein the authentication initiator receives the responder certificate chain and the responder signature, and verifies the responder signature using the public key.

12 . The method of claim 9 , wherein the authentication responder receives an initiator public key along with the initiator certificate chain and the initiator signature from the authentication initiator, and transmits a responder public key along with the responder certificate chain and the responder signature to the authentication initiator;
wherein the method further comprising: generating, by the authentication responder, a responder symmetric key using the initiator public key.

13 . The method of claim 12 , wherein the authentication initiator generates an initiator symmetric key identical to the responder symmetric key by using the responder public key.

14 . The method of claim 12 , wherein, after the responder symmetric key is generated, the authentication responder authenticates the authentication initiator using the responder symmetric key with the authentication initiator.

15 . The method of claim 9 , wherein the authentication initiator is a wireless power transmitter that transmits wireless power, and the authentication responder is a wireless power receiver that receives the wireless power.

16 . The method of claim 9 , wherein the authentication responder is a wireless power transmitter that transmits wireless power, and the authentication initiator is a wireless power receiver that receives the wireless power.

17 . A method for performing re-authentication between an authentication initiator and an authentication responder each holding an encryption key through an existing authentication procedure in a wireless power transfer system, the method comprising:
transmitting, by the authentication initiator, an authentication request message including an initiator digest encrypted using the encryption key to the authentication responder; receiving, by the authentication initiator, an authentication response message including a responder digest encrypted using the encryption key from the authentication responder which authenticates the authentication initiator by decrypting the encrypted initiator digest with the encryption key; and authenticating, by the authentication initiator, the authentication responder by decrypting the encrypted responder digest with the encryption key.

18 . The method of claim 17 , wherein the authentication request message further includes an initiator timestamp encrypted with the encryption key,
wherein the authentication response message further includes a responder timestamp encrypted with the encryption key, and wherein the authentication initiator authenticates the authentication responder by decrypting the encrypted responder type stamp together with the encrypted responder digest with the encryption key.

19 . The method of claim 18 , wherein a value of the responder timestamp is a value of the initiator timestamp plus one.

20 - 22 . (canceled)

Assignees

• Lg Electronics Inc

Inventors

• Kim Jaehyu
• Choi Jingu
• Lee Minsoo
• Lim Jinkwon

Classifications

• H02J7/47

  Arrangements for checking compatibility or authentication between one component, e.g. a battery or a battery charger, and another component, e.g. a power source · CPC title

• H04L2209/80

  Wireless · CPC title

• H04L9/3247

  involving digital signatures · CPC title

• H04L9/3297

  involving time stamps, e.g. generation of time stamps · CPC title

• H04L9/3273

  for mutual authentication (network architectures or network communication protocols for achieving mutual authentication in a packet data network H04L63/0869) · CPC title