Traditional postage meters must be presented to a branch post office to be loaded with postage. The postage credit is stored in a register sealed in the machine. U. S. Postal Service. Annual report of the postmaster general , fiscal year 1991. In this section, we examine the use of cryptographic techniques to protect the stamp on an envelope.
Most mail is metered or printed.
Figure 3.2 shows an example of a postage meter indicia. Traditional postage meters must be presented to a branch post office to be loaded with postage. The postage credit is stored in a register sealed in the machine. U. S. Postal Service. Annual report of the postmaster general , fiscal year 1991.