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Asymmetric key wrapping using a symmetric cipher

  • US 8,681,996 B2
  • Filed: 07/31/2007
  • Issued: 03/25/2014
  • Est. Priority Date: 07/31/2007
  • Status: Active Grant
First Claim
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1. A method of asymmetric key wrapping in a system, comprising the steps of:

  • (A) transferring a first key from a storage in said system to a cipher in said system while in a first of a plurality of modes, wherein (i) an operation of said cipher utilizes a second key, (ii) said cipher is selectable between an encryption and a decryption as determined by a first signal and (iii) said first signal selects said modes;

    (B) receiving a second signal into said system, said second signal carrying a third key in an unencrypted form;

    (C) generating a fourth key by encrypting said third key with said cipher using said first key as said second key while said system is in said first mode; and

    (D) presenting a third signal external to said system while said system is in said first mode, said third signal carrying said fourth key.

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