Patent ID: 8145907
Filing Date: 2012-03-27
Classification: H04L,H04W

Abstract:
1. A method comprising: generating randomly a first symmetric key at a first radio communication device of a first party; encrypting user data of the first radio communication device with the generated first symmetric key at the first radio communication device; encrypting, at the first radio communication device, the generated first symmetric key with a public key of a third party; sending the encrypted first symmetric key from the first radio communication device to a second radio communication device via a transfer device of a second party; decrypting, at the second radio communication device, the received encrypted first symmetric key using a secret key associated with the public key and comprised in a security device of the third party, the security device connected to the second radio communication device, sending the encrypted user data from the first radio communication device to the second radio communication device via the transfer device, and decrypting, at the second radio communication device, the received encrypted user data with the decrypted first symmetric key, wherein the method is configured to provide secure data transfer from the first radio communication device of the first party to the second radio communication device, and the data transfer is configured to be overseen by the transfer device of the second party; wherein the decrypting, at the second radio communication device, the received encrypted first symmetric key using the secret key associated with the public key and comprised in the security device of the third party further comprises: generating randomly, at the second radio communication device, a second symmetric key, generating, at the second radio communication device, a request message comprising the generated second symmetric key and the received encrypted first symmetric key, and the request message encrypted with the public key, sending the request message from the second radio communication device to the security device, decrypting, at the security device, the received request message with the secret key to obtain the second symmetric key and the encrypted first symmetric key, further decrypting, at the security device, the obtained encrypted first symmetric key with the secret key to obtain the decrypted first symmetric key, generating, at the security device, a response message comprising the obtained first symmetric key, and the response message encrypted with the obtained second symmetric key, sending the response message from the security device to the second radio communication device, and decrypting, at the second radio communication device, the received response message with the generated second symmetric key to obtain the decrypted first symmetric key.