Secure memory card

  • US 5,293,424 A
  • Filed: 10/14/1992
  • Issued: 03/08/1994
  • Est. Priority Date: 10/14/1992
  • Status: Expired due to Term
First Claim
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1. A secure memory card for use with a host portable computer, said memory card comprising:

  • a microprocessor connected for transmitting and receiving address, data and control information to and from said host computer and said microprocessor including;

    an addressable non-volatile memory for storing information including a number of key values and configuration information;

    an internal bus connected to said microprocessor for transmitting address, data and control information defining memory operations to be performed by said card; and

    ,at least one non-volatile addressable memory being connected to said internal bus in common with said microprocessor for receiving said address, data and control information, said memory including a non-volatile memory section and a security control section, said memory section containing a memory array organized into a number of blocks, each block having a plurality of addressable locations and control logic means for performing said memory operations and said security control section being connected to said internal bus, to said control logic means and to said memory array, said security control section including;

    a number of non-volatile and volatile storage devices for storing at least one of said key values and configuration information associated with said blocks; and

    ,access control logic means connected to said control logic means and to said storage devices, said access control logic means enabling reading of information stored in addressed ones of said blocks of said memory array as specified by said configuration information only after said microprocessor has determined that a predetermined authentication procedure has been performed with said host computer and has enabled said access control logic means for allowing reading of said information from said memory array according to said configuration information.

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