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Key management system for mixed-trust environments

  • US 5,850,443 A
  • Filed: 08/15/1996
  • Issued: 12/15/1998
  • Est. Priority Date: 08/15/1996
  • Status: Expired due to Term
First Claim
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1. A method of managing cryptographic keys between first and second parties in communication environments of different degrees of trust comprising the steps of:

  • the first partyencrypting a cryptographic key by using a low trust encryption public key of the first party having a first key length, to generate a first party encrypted cryptographic key,encrypting the cryptographic key using a higher trust encryption public key of the second party having a second key length longer than the first key length to generate a second party encrypted cryptographic key, andconcatenating the first party and second party encrypted cryptographic keys, andthe second party, upon reception of the concatenated data,decrypting the second party encrypted cryptographic key to recover the cryptographic key.

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