Wireless power transfer device authentication

Abstract

A method for authentication for wireless power transfer which comprises: receiving an initial certificate signed using a private key associated with an intermediate certificate authority (CA) certificate; determining that the intermediate CA certificate is revoked; determining if a replacement certificate for the initial certificate exists; and if a replacement certificate for the initial certificate exists, trusting a wireless power transfer device associated with the initial certificate.

1 . A method for authentication for wireless power transfer, the method comprising:
 receiving an initial certificate signed using a private key associated with an intermediate certificate authority (CA) certificate;   determining that the intermediate CA certificate is revoked;   determining if a replacement certificate for the initial certificate exists; and   if the replacement certificate for the initial certificate exists, causing wireless power transfer to a device associated with the initial certificate.   
     
     
         2 . The method of  claim 1 , wherein if the replacement certificate for the initial certificate does not exist, the method further comprises one of:
 foregoing wireless power transfer to the device associated with the initial certificate; and   initiating wireless power transfer with the device in accordance with a system policy of the initiator for untrusted devices.   
     
     
         3 . The method of  claim 1 , wherein determining that the intermediate CA certificate is revoked comprises:
 querying a certificate revocation list for the intermediate CA certificate.   
     
     
         4 . The method of  claim 1 , further comprising
 obtaining a replacement certificate list; and   querying the replacement certificate list for a replacement certificate for the initial certificate.   
     
     
         5 . The method of  claim 4 , wherein the replacement certificate list comprises one or more public keys, each public key being associated with a revoked intermediate CA certificate. 
     
     
         6 . The method of  claim 5 , wherein querying the replacement certificate list for a replacement certificate for the initial certificate comprises:
 determining if the replacement certificate list comprises a public key of the initial certificate.   
     
     
         7 . The method of  claim 4 , wherein obtaining the replacement certificate list comprises:
 obtaining a link from a certificate revocation list, the link being associated with an entry in the certificate revocation list, the entry associated with the intermediate CA certificate; and   obtaining the replacement certificate list using the link.   
     
     
         8 . The method of  claim 4 , wherein obtaining a replacement certificate list comprises:
 obtaining a certificate revocation list, wherein the certificate revocation list comprises the replacement certificate list.   
     
     
         9 . The method of  claim 4 , wherein the replacement certificate list is signed by a root CA. 
     
     
         10 . The method of  claim 4 , wherein the initial certificate comprises a public key, and the replacement certificate comprises the public key. 
     
     
         11 . The method of  claim 4 , wherein the replacement certificate comprises a serial number of the initial certificate. 
     
     
         12 . The method of  claim 1 , wherein receiving an initial certificate comprises:
 requesting the initial certificate from the device.   
     
     
         13 . The method of  claim 1 , further comprising:
 performing challenge-response authentication with the device.   
     
     
         14 . The method of  claim 13 , wherein if the challenge-response authentication is successful, the method further comprises one of:
 initiating wireless power transfer with the device; and   initiating wireless power transfer with the device in accordance with a system policy of the initiator for trusted devices.   
     
     
         15 . The method of  claim 14 , wherein initiating wireless power transfer with the device in accordance with a system policy of the initiator for trusted devices comprises:
 initiating wireless power transfer with the device at a higher power.   
     
     
         16 . The method of  claim 13 , wherein if the challenge-response authentication is not successful, the method further comprises one of:
 foregoing wireless power transfer with the device; and   initiating wireless power transfer with the device in accordance with a system policy of the initiator for untrusted devices.   
     
     
         17 . The method of  claim 16 , wherein initiating wireless power transfer with the device in accordance with a system policy of the initiator for untrusted devices comprises:
 initiating wireless power transfer with the device at a lower power.   
     
     
         18 . The method of  claim 1 , further comprising:
 if the replacement certificate for the initial certificate does not exist, determining that a device associated with the initial certificate is untrusted.   
     
     
         19 . The method of  claim 18 , further comprising:
 if the device associated with the initial certificate is untrusted, foregoing wireless power transfer with the device.   
     
     
         20 . The method of  claim 1 , wherein the initial certificate is part of a certificate chain. 
     
     
         21 . The method of  claim 1 , wherein the device is a wireless power transmitter. 
     
     
         22 . The method of  claim 1 , wherein the device is a wireless power receiver. 
     
     
         23 . A wireless power transfer device configured to perform the method of  claim 1 , wherein the wireless power transfer device is one of a wireless power receiver and a wireless power transmitter. 
     
     
         24 . A system for a certificate authority, comprising:
 one or more processors; and   a memory;   wherein the memory comprises instructions which, when executed by the one or more processors, cause the one or more processors to:   provide a certificate revocation list comprising one or more revoked intermediate CA certificates; and   provide a replacement certificate list, each entry of the replacement certificate list being associated with a public key of an initial certificate of a wireless transfer device, the initial certificate being signed by one or more of the one or more revoked intermediate CA certificates.   
     
     
         25 . The system of  claim 24 , wherein the certificate revocation list and/or the replacement certificate list are signed by a private key associated with the system.