Method for certifying public keys used to sign postal indicia and indicia so signed
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United States of America Patent
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Jan 25, 2005
Grant Date -
N/A
app pub date -
Mar 30, 1999
filing date -
Mar 30, 1999
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A method for certifying the public key of a digital postage meter using a public key encryption system by a certifying authority. A certifying station and a user station, or a digital postage meter, exchange information and the user station and downloads, or the meter derives, a public key from the exchanged information. The certifying station also publishes related information and its public key. A third party can derive the public key corresponding to the meter's private key by operating on the published information with the certifying station public key.
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