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METHOD AND SYSTEM FOR DISTRIBUTING CRYPTOGRAPHIC KEYS IN A HIERARCHIZED NETWORK

  • US 20110261962A1
  • Filed: 11/13/2008
  • Published: 10/27/2011
  • Est. Priority Date: 11/13/2007
  • Status: Active Grant
First Claim
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1. A method for distribution of cryptographic keys in a hierarchized network comprising at least one device responsible for a first group of devices, at least one of the devices of said first group of devices also being responsible for a second group of devices lower than said first group of devices, the method comprising the steps, at the device responsible for the higher group, of:

  • a. storinga set of identifiers specific to the first group,an identifier specific to the responsible device of the first group,an identifier for each device responsible for a lower group,each identifier being unique inside the hierarchized network,b. storing storage (24) of a root cryptographic key,c. supplying a root cryptographic key to each device responsible for a lower group by derivation from the root key and from the identifier of said device responsible for the lower group by a first, nonreversible cryptographic function,d. supplying at least one transport cryptographic key to each member of said first group of devices by derivation from the root key and from an identifier belonging to the set of identifiers specific to said first group by a second, nonreversible cryptographic function.

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