摘要：As com putin g d ev ices b ecom e ubiq uitou s and in creasingly mob ile, it b ecom es obv ious that as ynchron ous an d d irect peer-to-peer com mun ication mod el is no t suffi cient in dis tribu ted comp utingen viro nment. Us ing an ind irect event service instead of other tradition al comm unication mo del has anad vantage of decreasin g the coup ling of app lication s in a d is tribu ted env iron ment an d remov ing the n eedfor m an y static depend encies. In th is p ap er, we design an d im plement th e secu re event service forp ro vidin g s ecure ub iquito us co mputin g en viro nment. The Secure Ev en t Serv ice im plemented en ab les users top erform certificate-based ev en t retrieval, and su ppo rts on ly elig ible event coms umer and event prod ucer canp ublish an d receiv e events throug h the secure event service. certificate is used fo r sup porting auth en ticationan d au thorizatio n in the secu re event service. In order to pro vide a co ntent-b as ed ev en t retrieval, anasy nchrono us com mun ication between ev ent prod ucers an d con sumers
关键词：u-Cam pus; Certificate; Certificatio n Au th ority ; Registratio n Auth ority
