Encryption and authentication systems and methods
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United States of America Patent
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Aug 23, 2011
Issued Date -
N/A
app pub date -
Mar 19, 2007
filing date -
Mar 5, 2001
priority date (Note) -
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Abstract
Methods, apparatus, and systems are disclosed for, among other things, passphrase input using secure delay, passphrase input with characteristic shape display, user authentication with non-repeated selection of elements with a displayed set of elements, document authentication with embedding of a digital signature stamp within a graphical representation of the electronic document wherein the stamp comprises digits of a digital signature, and sub-hash computation using secure delay.
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