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Method for certifying public keys in a digital signature scheme

  • US 5,420,927 A
  • Filed: 02/01/1994
  • Issued: 05/30/1995
  • Est. Priority Date: 02/01/1994
  • Status: Expired due to Term
First Claim
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1. A method for certifying pieces of data in a secure communications system with at least two levels of authorities, comprising the steps of:

  • presenting a piece of data requiring certification to a first-level authority for inspection of a given property;

    if the piece of data passes the inspection of the first-level authority, having the first-level authority send to a higher authority a digital signature evidencing that the piece of data has passed the inspection of the first-level authority; and

    if the digital signature of the first-level authority is correct, having the higher authority issue a certificate, which does not include a signature of the first level authority, that the piece of data possesses the given property.

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