5. 15. 25.35. 45.55. 65. 7
5.1
Kk1,k2kn,K=f(k1,k2,kn)k1,k2,,knK
5.2First VirtualSSLSecure Electronic Transactions (SET)
First VirtualFirst Virtual
First VirtualFV(First Virtual)FVFVFVemailFVFV
SSLSSL
Secure Electronic Transactions(SET)SETMasterCardVisa
SET1.2.3.4.5.6.7.8.9.
5.3 /
SignedBank(Bank Name, Owners Name,Amount,Destination, Serial number)
NetCheque(USC)NetBill(Carnegie-Mellon Univ.)
5.4Digital Cash
E-cash
kmi=(bank, amount, ki,currency), Kinb1, b2, , bk Bimibie e Bik-1BibiBiBjSigned(Bi)Signed(Bi)Signed(mi)
IdiFirst CYBER BankEncrypted :key(2i,m)IdiFirst CYBER BankEncrypted :key(2i+1,m)Idi+1First CYBER BankEncrypted :key(2i+2,m)Idi+1First CYBER BankEncrypted :key(2i+3,m)CustomerID = f(Idi,Idi)
NetCash(USC)DigiCash
5.5ATM
MondexNatWest Bank 1996ATM VisaCashVISAMASTERCARDEUROPAYEMVVisaCashMondexVisaCashVISA1995VISA Visa Easy Entry
5.6
CyberCoinMillicentMicroMint
5.7
1.07 0.54 ATM 0.27 PC 0.15 0.01