Value-added services have been promising applications in Vehicular Ad Hoc Networks (VANETs) in recent years. In VANETs, Road Side Units (RSUs) cannot cover all areas, causing intermittent connectivity. As a result, how to snsure security and privacy for downloading data continuously in such a highly dynamic environment is still a problem. In this paper, we present a cooperative downloading scheme for value-added services in VANETs, which can realize continuous services enjoying even out of the communication range of RSUs. Moreover, in order to realize security and privacy of data enjoying, we employ Cipher text Policy Attribute Based Encryption with Constant Length (CP-ABE-CL) according to users' charge levels, ensuring the anonymity of receivers.
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