Cryptographic key distribution using key unfolding
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United States of America Patent
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N/A
Issued Date -
Jul 15, 2004
app pub date -
Jul 21, 2003
filing date -
Jul 19, 2002
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
Methods, computer-readable media, and apparati for securely distributing a cryptographic key (C) from a first party(s) to a second party(s). A method embodiment of the present invention comprises the steps of combining (steps 1 and 2) the cryptographic key (C) with a fresh transport key (T) to form a key set; unfolding (step 10) a previous transport key (T) to form an unfolded transport key (UT); encrypting (step 7) the key set using the unfolded transport key (UT) to form an encrypted key set; distributing (step 8) the encrypted key set across a medium (3); and decrypting (step 9) the encrypted key set using the unfolded transport key (UT) to reconstitute the cryptographic key (C) and the transport key (T).
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