Postage security device having cryptographic keys with a variable key length
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Mar 15, 2005
Grant Date -
N/A
app pub date -
Nov 2, 2000
filing date -
Nov 2, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A cryptographic method for providing a level of security by a postage security device, which generates a digital token using a cryptographic key. When it is required to make a key change in order to improve the level of security, the postage security devices replaces the cryptographic key with a new cryptographic key, wherein the new cryptographic key has a key length that is equal to or greater than the replaced cryptographic key. The new cryptographic key can be generated by the postage security device based on a given key length, or selected from a plurality of replacement keys stored in a storage device.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
Advertisement
Advertisement
Advertisement
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully