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Information transmission method and apparatus

  • US 6,243,469 B1
  • Filed: 09/16/1998
  • Issued: 06/05/2001
  • Est. Priority Date: 09/18/1997
  • Status: Expired due to Fees
First Claim
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1. An information transmission apparatus for use in an information transmission system where encrypted information comprised of a plurality of information units each hierarchically encrypted and multiplexed to each other is communicated between at least two parties, the information being encrypted for the transmission, said apparatus comprising:

  • an information unit producing means for producing the information unit;

    a first encryption means for encrypting the information unit with a first predetermined encryption system to produce an encrypted information unit; and

    a first multiplex means for multiplexing at least one of the information unit and the encrypted information unit to produce a multiplexed information unit.

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