Date: 2006-03-31 18:42:41

Cultural history

Information Based Indicia

Indicia

United States Postal Service

Postage meter

Postage stamp

Franking

Envelope

Mail

Philately

Postal system

Terminology

Carnegie Mellon University Computer Science technical reports CMU-CS[removed]Cryptographic Postage Indicia J. D. Tygar and Bennet Yee and Nevin Heintze January 1996

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