How can we characterize electronic commerce protocols. The field of electronic commerce has many open problems. Can they be mutually compatible . Cryptographic Postage Indicia . In this section, we examine the use of cryptographic techniques to protect the stamp on an envelope.
Most mail is metered or printed.
Figure 2 shows an example of a postage meter indicia. Cryptographic postage indicia , 1995. Note that throughout the text I use male pronouns to refer to merchants and female pronouns to refer to customers. How can we characterize electronic commerce protocols. The eld of electronic commerce has many open problems.