ding, nhiing biOn phap nao kh8ng hiOu qua can thay doi, liOu co nhftng m6i de dga man xuat hiOn hay cal nhitng cai tin hoac thay doi gi trong cong nghO, hoac co nhftng tai san nao khaa cua doanh nghiOp can bao dam an ninh.
4.3.1. Nhiing bien phdp co ban dam bolo an tam cho giao djch TMDT
BiOn phap hitu hiOu nhat hiOn nay trong viOc dam bao tinh xac thuc la sir dung ha tang khoa cong khai (PKI — Public Key Infrastructure) trong do co sir dung cac thi& bi ky thuat, ha tang va quy trinh d6" irng dung viOc ma hoa, cho ky s6 va chirng chi s6. Cac ky thuat sir dung trong Ha tang khoa cong khai co th6" hiL nhu sau:
- Sir dung ky thuat ma hog thong tin:
MA hod thong tin la qud trinh chuy6n cac van ban hay cac tai liOu g6c thanh cac van ban duari clang mat ma bang cach sir dung mot thuat ma hoa. Giai ma la qud trinh van ban dang mat ma dugc chuy6n sang van ban g6c dtra teen ma khoa. Muc dich cua ky thuat ma hod nham dam bao an town cho cac thong tin dugc ltru gift va dam bao an toan cho thong tin khi truy6'n phat. MA hod thong tin la mot ky thuat dugc sir dung fat sann ke tir khi loci ngtroM bat dau giao tiep vad nhau va thuat ma hoa ding phat tri6n tir nhang thuat todn rat so khai truacc day tad cac cong nghO ma hoa phirc tap hi'0 nay. MOt phan mein ma He se thgc hiOn hai cong down: thir nhat la tao ra mOt chia khoa va thir hai la sir dung chia khoa d6 cung thuat ma h6a de ma h6a
van ban hoac giai ma.
Co hai ky thuat co ban thuang duac sir dung de ma hod thong tin la ma hod "khod don" sir dung mOt "khod bi met" va ma hod kep sir dung hai khoa g6m "khod ding khai" va "khoa bi met".
+ Ky thuat ma hoa dun sir dung mOt khod khod bi met:
Ma hod khod bi met, con goi IA ma hod d6i xirng hay ma hod khod rieng, lA viec sir dung mOt khod chung, gi6ng nhau cho ca qud trinh ma hod va qud trinh giai ma. Qua trinh ma hod khod bi mat duac thpc hien nhu minh hoa trong hinh 4.1.
Hinh 4.1: Hwang phap ma hod kholi rieng
Ngudn: Nh6m tac gici ty tdng h973 2008
Tuy nhien, tinh bao mat trong phucmg phdp ma hoa bi mat phu thuOc rAt lan vao chia kh6a bi met. NgoAi ra, sir dung phuang phdp ma hod khod bi met, mOt doanh nghiep rAt kho có th6 thpc hien viec phan phi an toan cac ma khod bi mat von hang ngAn khdch hang trpc tuy6n cua minh tren nhirng mpg thong tin rOng 16.n. Va doanh nghiep se phai b6 ra nhang chi phi khong nho cho viec tao mOt ma khod rieng va chuy6n ma khod do tai mOt khach hang bAt k57 tren mang Internet IN ho co nhu cau giao dich von doanh nghiep. Vi du, mOt trong cac hinh thirc don gian cua khoa bi mat la password de khoa va ma khoa cac van ban word, excel hay power point.
+ Ky thuat ma hoa kep sir dung khod cong khai va khoa bi mat
Ky thuat ma hod nay sir dung hai khod khdc nhau trong qud trinh ma hod va giai ma: mOt khod dung de ma hod th8ng diep va mOt khod khdc dung a giai ma. Hai ma khod nay co quan he von nhau ve mat thuat toan sao cho du lieu ducic ma hod bang khod nay se dugc giai ma bang khod kia. Khod ding cong la phan m'em c6 th6 cong khai cho nhieu nguai bitt, con
khod rieng dugc gift bi mat va chi minh chit nhan cita no dugc biet va c6 quyen sir dung.
Hinh 4.2: Phircrng phi') ma hofi khoi cong cong
Ngudn: Nhom teic gia tit tong kp 2008
Nhu vay, ky thuat ma hoa nay darn bao tinh rieng to va bao mat, vi chi co nguei nhan thong diep ma hoa dugc girl den mm co the giai ma dugc.
Ngoai ra kYr thuat nay ding dam bao tinh town yen, vi mgt khi thong diep ma
h6a bi xam pham, qua trinh giai ma se khong thuc hien dugc.
Trong qua trinh sir dung, c6 mot s6 dac diem can km y d6i voi hai ky thuat ma h6a tren.
Bang 4.1: So sfinh phircrng phip ma hofi khoa rieng
va ma hofi khofi cong cong
D4c dam MA hoi khoi rieng MA hofi khofi cong cong
S6 khoa MOt khoa don MOt cap khoa
Loai khod Khoa bi mat MOt khoa bi mat va mgt kh6a
cong khai
Quan V, khod Dan gian, nhung kh6
quan 15,
Yeu cau cac chimg nhan dien tir va ben tin cay thin ba
T6c dO giao dich Nhanh Chain (adsbygoogle = window.adsbygoogle || []).push({});
Sir dung Sir dung de ma hod
nhilng du lieu 16n (hang kat)
Sir dung d6i voi nhimg img dung c6 nhu cAu ma hod nho lion nhu ma hod cac tai lieu nho hoac de 14 cac thong diep