An　security　communication　model　for　vehicular　clouds　(VC)　based　on　trusted　computing　was　proposed.　With　the　help　of　a　trusted　third　party,　at　the　beginning　of　communications　services　process,　the　model　generated　a　temporary　identity　for　VC　users,　namely　to　anonymize　the　identity　of　these　users　in　order　to　protect　user＇s　privacy.　And　then,　during　the　communication　process,　the　user＇s　identity　legitimacy　and　credibility　authentication　were　verified　with　the　bilinear　pairings　signature　algorithm,　which　used　the　random　number,　key　and　time　stamp　effectively.　The　key　and　the　hash　function　ensure　the　signature　to　be　unforgeable,　the　timestamp　ensures　that　the　key　is　valid　during　a　limit　period,　and　the　random　number　prevents　replay　attacks.　Analysis　shows　that　this　model　has　the　credibility,　security,　anonymity,　and　the　characteristics　of　the　resistance　to　attack.　©,　2014,　Huazhong　University　of　Science　and　Technology.　All　right　reserved.