Long-term secure digital signatures
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United States of America Patent
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Sep 18, 2012
Grant Date -
Dec 31, 2009
app pub date -
May 28, 2008
filing date -
Mar 4, 2003
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A method for digitally signing of electronic documents which are to be kept secure for a very long time, thereby taking into account future cryptographic developments which could render currently cryptographic key-lengths insufficient. A double signature is issued for each document. A first digital signature ensures the long term security, while a second digital signature ensures the involvement of an individual user. Thereby, the second digital signature is less computationally intensive in its generation than the first digital signature.
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