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Instrument for making secure data exchanges

  • US 6,493,823 B1
  • Filed: 03/03/1999
  • Issued: 12/10/2002
  • Est. Priority Date: 09/04/1996
  • Status: Expired due to Fees
First Claim
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1. An instrument for making secure messages exchanged between each of the actors of a network having a plurality of actors, each being capable of acting as a sender or as an addressee of a message that is encoded or sealed, the instrument being characterized in that it comprises, for each actor, a respective device (E1) including an integrated circuit with memory zones (2, 3) and a microprocessor (1) capable of executing at least one algorithm and of controlling access to said zones (2, 3) as a function of the nature of the operation requested thereof by the operator holding the device (E1), the operations being selected from the following:

  • encoding (6, 7);

    calculating a key to be communicated (8); and

    decoding (9, 10);

    the memory zones (2 and 3) containing two types of base key that are masked, including a base key (T1) of a first type which is specific to each device (E1), and at least one base key (U) of a second type which is common to all of the devices.

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