^ HOC UNG DUNG CONG NGHE W1FI VffI C O N G DONG Hoang Trung Dung Wifi - Wireless Fidelity Id ten goi md cdc nhd sdn xuat ddt cho mdt chuan ket ndi khdng ddy (IEEE 802.11), cdng nghe sit dung sdng radio de thiet lap he thdng ket ndi mang khdng ddy Vd cdng nghe Wifi trd nen phd bien vd phdt trien manh a Viet Nam Ddy Id cdng nghe mang tien tien tren the gidi Wifi ddc biet thich hap cho nhu cdu sit dung di ddng vd cdc diem truy cap ddng ngudi ddng Loai hinh dich vu ndy dd gdp phdn thay ddi mot cdch ddng ke cudc sdng, thdi quen hdng ngdy cua chung ta Wi-Fi va nhirng tien ich Cdng nghe thdng tin dang phit triin nhu vu bao, vi nd da tic ddng manh me tdi mgi mat ddi sdng, xa hdi Cudn theo dd li le Idi sinh hoat, lim viec, hgc tip Va wifi la mgt nhiing cdng nghe diin hinh Chung ta ching cdn la gi vdi nhung quin cafe Internet ben dudng, cac tip thi vi ci nhin su dung wifi Nhiiu ngudi xich laptop tdi nhirng quin cafe wifi vdi muc dich thu giin, ludt web gui mail vi cQng cd ngudi tdi day di thi hien minh Ngay tai nhung noi cdng cdng ta cung cd Ihe bat gap nhieu ngudi hi hoiy ben chiic miy tinh di ludt web, chat Hien tai cic trudng dai hgc nude diu cd phu sdng wifi de phuc vu mdt cich td't nhit nhu ciu hgc tip vi giing giay ciia giing vien, cin bd, sinh vien Ddi vdi nhieu sinh vien, laptop li mgt dung cu khdng the thiiu din trudng Binh thudng ngoii gid hgc phii sii dung miy tinh giii lag sinh vien ed the giii tri tren Intemet qua sdng wifi eiia ndi bd tnrdng Viec ludt web qua wifi gin nhu da an siu vio thdi quen cua nhiiu ngudi chu yeu li thieu nien sinh vien Tuy nhien cd mdt bg phin ldn ngudi truy cap wifi hien diu li dung "liu", hg Igi dung su "thdng thoing" cua chi wifi de dung thoii mii mi khdng phii tra tiin Ddi vdi nhung ngudi khdng cd diiu kien hoi mang Intemet tai nhi hoac di cdng tic thi viec truy cap mang diing "chua" wifi diin mdt cich vd tu Khdng chi dimg lai d cic quin cafe, hien 30 TAP CHf TIN HOC NGAN H A N G • a cie thinh phd ldn nhu Hi Ndi, Tp Hd Chi Minh edn cd mdt "tri di Wi-Fi" Viec nhiiu sinh vien lui tdi cic quin "tri di Wi-Fi", cd thi giii thich bang ly kinh te Chi vdi lOOOd tiin nude che hg cd thi tha hd hoi mang, online Mdt le duong nhien li chi cd quin tri di nio "xjn" din muc di lip Wi-Fi di miin phi khich hing chi tri 1.000 d cho mdt lin ngdi quin ci Thye ti, nhung quin tri di ay vd tinh dugc "hudng xii" Wi-Fi tir nhung dai nha hing, ci phe Wi-Fi Ddi vdi nhieu sinh vien, viec la ci cic khu cdng cdng di dung chua wifi cd thi tiit kiem cho hg tiin vao mang mdi ngiy Ngudi tmy cip nhiiu cd the tiit kiem hing tram ngin tien net hing thing Thye ti thi ngdi ci phe Wi-Fi ehd yen tinh vin thich, nhung vdi cic cd ciu sinh vien, dieu dd khdng hgp li vi xa xi, nhit li Wi-Fi di "phu sdng" via he! Dd cung li li khie'n nhiiu sinh vien khdng sir dung djch vu Internet cd dinh Ld hdng cua mang khdng day wifi va nhung he luy Tuy cd nhiiu Igi ich, nhung Wifi cung gdp mdt phin vio nhung nguyen nhin cho sy hgc hinh sa Slit ciia ci biet mdt sd sinh vien liy cic cudc vui diia, tieu khiin tren mang lim trgng Khdng it ban sinh vien gip thay vi hgc hinh, tim tai lieu mi cic ban lai sii dung wifi cd trudng di choi game online, chat chit Hg chg ring viec trudng minh cd lip dat wifi li mgt co hdi di "xii chua", thgii mii dgwnload Thim ehi cd nhiiu ban sir dung wifi di dny cap vio $ 5(105) - 8/2009 nhung trang web "ban" Cic loai vin hda pham ddi Qriy "the gidi ao" ludn ed sue hip dan rat ldn ddi vdi hg Tit nhien sd It niy rit di bj sa nga, vudng vio cic te nan Nhu vay ban da khdng tin dung nhttng thuin Igi di giup minh tie'n bd mi lai di nguge lai Cd nhiiu ban, mac du dang gid hgc, cung chat, choi game Viec lo li nhu viy se tao thinh mdt Id hdng kiin thiic, va hg se ngiy cang xa rdi giing dudng dai hgc Diiu dd se anh hudng rat nhiiu tdi tuong lai ciia cic ban Cdn nhiiu trudng hgp khic, nhiiu hd gia dinh, doanh nghiep, tip thi kit ndi Internet khdng big ve dugc quyin tmy cap khdng day cua hg bing mil khau va ma hda Hg gin nhu "di ngd cira" cho ngudi qua dudng va hing xdm in cip quyin truy cap, vi di nhien nhirng ke "an cip" niy khdng phii tri tiin cho bat cu nhi cung cap dich vu Internet (ISP) nio Thudng thi viec su dung wifi "chia" Ii hoin loan binh thudng, bdi nd it giy phuong hai cho c i thue bao wifi Cd ching cung chi la lim chim hon tdc truy cap mang cia chii sii dung Tuy nhien diiu niy ehi xiy ngudi ding nhiiu De doa ldn nhat cua viec xii chia wifi din tir cic tay hacker, ddi vdi chung viec hack mang tmy cap Wi-Fi li diiu khdng khd khin gi Da cd nhiiu khuyin cio cic chii hg gia dinh vi dganh nghiep dung Intemet khdng diy nen thiet lip mang ludi vdi nhung bien phap bio mat cao nhit, dim bao sy ma hda manh me kjp thdi nhim ngin chan tin tac (hacker) dung trdm, di phdng ning bj liy cip ten ngudi dung (usemame), mit TIN HOC UNG DUNG khiu (password) vi cie thdng tin quan trgng khic Neu khdng ma hda mang ludi khdng day, nhttng ke tdi pham io se theo ddi dugc nhttng gi ban dang lam, du chi li ludt Net hay tmy cap tii lieu cdng viec tir xa Thim chi, chiing cd thi lim miy tinh cua ban bj lay nhiim nhung ma ddc de tir dd lay cip thdng tin nhin dang ci nhan Bdi viy, kit ndi Wi-Fi can dugc ma hda, ddng thdi chic chin mat khau cua ban khdng di ding bj doin hoac tan cdng Cii khd li nhiiu thiit bj tiep nhin sdng Wi-Fi hien cQa ngudi dung khdng cd kha ning ty phdng ve trudc cic vu dot nhap trii phip tir may tinh cua ngudi khic, die biet li tu nhinig hacker chuyen nghiep Trong thuc ti da ghi nhin nhiiu trudng hgp bj mat cip du lieu bdi viec sii dung wifi Viec mat cip dtt lieu dung wifi thudng xuat phit tir su chu quan la Ii cua ngudi ding, nim bit dugc so hd niy, cic tay hacker thudng tin cdng vio cac laptop kit ndi wifi cdng cdng Bdi kit ndi vio nhttng laptop niy vi an trdm thdng tin hoin toin khdng khd Khi hacker thiit lap miy laptop cua cd cung ten vdi diim Qny cap (gidng nhu cau hinh laptop), niu ngudi sir dung khting biit mi kit ndi vio mang niy thi toin bd thdng tin, dtt lieu, sd the tin dung cd thi di ding bj hacker an trdm Ldi khuyen mgi dndng hgp la ngudi sii dung nen cd chi dd bag mat chg miy cua minh ii bao toin du Ueu Will cho cdng ddng Wifi cho phip ngudi sir dyng Qny cap mang gidng nhu sir dung cdng nghe mang miy linh tmyin thdng tai bit cir thdi diim nio vung phu sdng Them vio dd, Wifi cd dd linh hoat vi ning phit friin mang ldn khdng bj inh hudng bdi viec thay ddi lai vj tri, thiit ki lai mang miy tinh Cung vi li mang khdng diy nen Wifi khic phuc dugc nhttng han chi vi dudng cip vat ly, giim dugc nhieu chi phi hiin khai thi cdng day mang vi khdng phii tic dOng nhiiu tdi co sd tang ciia dd thj Nim bat dugc nhttng uu diim dd hien tren the gidi da xuat hien nhieu du in kit ndi cdng ddng bing viec phi sdng wifi rdng khip thinh phd, vi thudng dugc ggi vdi cii ten du in "thinh phd wifi" Trgng du in niy, cic thiit bj phit sdng wifi se dugc bd tri theo timg cum khu din cu, khu cdng cdng sdng wifi phit tir cic thiit bj niy se giang kin toin bO thinh phd Ngudi din thinh phd se dugc su dung mien phi loai hinh djch vu khdng day niy Mgt van di dat li nang bio mit dtt liiu ci nhin cHa ngudi dung Khi mdt cdng ddng cung sir dung wifi, thi viec big mat cing dugc chu y day manh Bdi sd lugng ngudi diing ldn ddng thuin vdi nd li hoat ddng gia ting cia hacker, vi se dem den hau qui khdn ludng Khi dd yeu ciu dat vdi ngudi dung khdng chi dung lai d muc dd su dung mil khau big ve Bdi viec sir dung mil khau bio ve miy tinh su dung wifi hien chi gay them roue khd cho cic tay hacker mi thdi, miy tinh cua ban vin chua the an toin myet ddi Vi rdi van di niy cung da cd giii phip khic phuc dua tren khia canh ki thuat Cie nhi cung cip djch vu da dua nhieu y tudng, giai phip bio mil dugc cho li rat an loan Don cu nhu viec ung dung chuong trinh khoi phan cung cua miy tinh Mgt eg sy xam nhap bat hgp phip, d cung miy tinh se tu ddng ddng bing, cic du lieu ci nhan miy tinh cua ban se dugc bio ve tuyet ddi Tit nhien li mudn dung dugc tien ich niy thi ngudi su dung phii bd tiin tui Hien nhung thinh cdng vi dich vy Inter- net khdng day toin thinh phd diu din tu nhiing noi thye su coi Wi-fi la mdt djch vu cdng cdng St Cloud, mgt thinh phd cd 28.000 din d bang Horida da cd mdt mang Intemet khdng diy hoan loan miin phi Mang niy cQng cd nhirng van di cua no Ching han nhu nhimg diim "chit", nhung vin cd tdi hon 77% cdng din ciia thinh phd niy su dung Thanh phd Paris cung da tien hanh du in thinh phd wifi, hg dang hy vgng se cd khoing 80% thinh phd dugc phii mang khdng day vio cudi thip ky niy Viec tray cap vao mang Wi-Fi tai Paris se hoin toin miin phi vi dugc tri bdi cic cdng ty tu nhin Cic diim tray cap se dugc dit tai cic khu vye cdng cdng vi thu vien Cdn tai nude ta de in tren da dugc nhi nude len phuong in xay dyng, thi hien qua cic cudc hgp cua • • chinh phu vi cic bd nam 2008 vua qua Du in niy thye hien thi irng dung diu tien se la cic thinh phd trung tim ci nude Hien tai hon 5000 diim kit ndi Intemet khdng day miin phi cua he thd'ng Wifi FPT telecom da dugc thiit lip tai thinh phd Hi Ndi vi Hd Chi Minh Chuong trinh cd tdng sd vdn diu tu li 1,5 trieu USD, li giai doan dau tien tham vgng bien 02 dd thj ldn niy eac thinh phd Wifi, phu sdng khip mgi noi di mgi ngudi cd thi kit ndi Intemet mgi lie mgi noi miin phi Tuy nhien FPT se khdng miin phi mai mai Hg cung cap co sd ting cho Internet phit triin nhim qua dd ban cic dich vu gia tri gia tang tren Internet nhu diin thoai Intemet, xem phim, nhac so Vi mdi diy, bg TT-TT da nhit tri cao vdi viec xiy dyng Sa Pa thinh phd Wi-Fi, coi dd la "thuang hieu" du Ijch, cdng nghe cua Lio Cai Mgt cic cic dy in triin khai thinh cdng, khdng nhung dat nude dugc ning len mdt tim cao mdi vi khoa hgc cdng nghe, mi nd cdn giup cdng ddng xich lai gin hem Va chiing ta cung hy vgng vi mdt tuong lai tuoi sing vdi djch vu wifi cho eOng ddng • s6 5(105) - 8/2009 • TAP CHf TN HOC NGAN HANG 31 ... sdng wifi rdng khip thinh phd, vi thudng dugc ggi vdi cii ten du in "thinh phd wifi" Trgng du in niy, cic thiit bj phit sdng wifi se dugc bd tri theo timg cum khu din cu, khu cdng cdng sdng wifi. .. viec sii dung wifi Viec mat cip dtt lieu dung wifi thudng xuat phit tir su chu quan la Ii cua ngudi ding, nim bit dugc so hd niy, cic tay hacker thudng tin cdng vio cac laptop kit ndi wifi cdng cdng... Ueu Will cho cdng ddng Wifi cho phip ngudi sir dyng Qny cap mang gidng nhu sir dung cdng nghe mang miy linh tmyin thdng tai bit cir thdi diim nio vung phu sdng Them vio dd, Wifi cd dd linh hoat