| 摘要 |
A method of establishing direct and secure communication between two wireless communications devices is disclosed. The wireless communications devices each have an existing trust relationship with an authentication server operable to authenticate access to a communication network on the basis of those existing trust relationships. The method comprises: (i) sending a communication request message directly from a first wireless communications device to a second wireless communications device; (ii) operating one of said wireless communication devices to request a symmetric encryption key from an authentication server; (iii) responsive to said request, operating said authentication server to: authenticate said one of said wireless communications devices on the basis of said existing trust relationship; generate said symmetric encryption key on successful authentication of said one of said wireless communications devices; and send said symmetric encryption key to said one of said wireless communications devices; (iv) responsive to receiving said symmetric encryption key, storing said symmetric encryption key at said one of said wireless communications devices and communicating it directly to the other wireless communications device; (v) securing direct communications between said wireless communications devices using said symmetric encryption key.
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