Secure messaging systems

  • US 4,888,800 A
  • Filed: 03/01/1988
  • Issued: 12/19/1989
  • Est. Priority Date: 03/03/1987
  • Status: Expired due to Term
First Claim
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1. A secure messaging system comprising:

  • at least three terminals;

    a key distribution center;

    communication means for carrying messages amongst the terminals and between the terminals and the center; and

    means for providing a key means, a key transport key, and a plurality of data transport keys,the center being responsive to a message requesting a communication link between first and second ones of the terminals to encrypt the key means according to the key transport key and to send the encrypted key means to both terminals,each terminal being operative to decrypt the key means, to encrypt an associated one of the data transport keys according to the key means, to send the encrypted data transport key to the other terminal, to encrypt data according to the data transport keys, and to exchange the encrypted data with the other terminal.

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