In a described embodiment, a device pairing method is disclosed. The device pairing method comprises: generating, using a server (130), a user pairing identifier corresponding to a user profile; sending, using the server (130), the generated user pairing identifier for use by a first user device (110) of the user profile to pair a second user device (120) with the user profile. In another described embodiment, a device communication control method is disclosed. The method comprises: sending, using a challenging computing device (120) to a responding computing device (110), a random number and an associated key identifier; controlling communication based on a result of comparison of the response and verification HMAC values computed with the random number and one of a plurality of cryptographic keys identified by the key identifier.