Trust　plays　an　important　role　in　peer-to-peer　(P2P)　networks　for　enabling　peers　to　share　resources　and　services.　It　is　necessary　to　build　an　effective　security　trust　model　to　solve　the　trust　problem　during　interactions　between　peers.　In　this　paper,　we　propose　an　enhanced　trust　model　based　on　reputation.　We　apply　SupP2Prep　[1]　in　our　trust　model,　which　is　a　protocol　for　reputation　management　via　polling　in　P2P　networks,　but　with　three　adjustments.　Most　of　the　existing　trust　models　only　consider　the　poll　problem　from　the　perspective　of　trust.　Here,　we　consider　voting　for　peers　from　the　perspectives　of　both　trust　and　distrust.　Our　work　appears　to　be　the　first　attempt　to　incorporate　distrust　in　the　polling　algorithm.　The　proposed　model　is　shown　to　be　robust　in　the　presence　of　attackers　through　simulation.　©　2008　IEEE.