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Information processing apparatus with replaceable security element

  • US 5,111,504 A
  • Filed: 08/17/1990
  • Issued: 05/05/1992
  • Est. Priority Date: 08/17/1990
  • Status: Expired due to Term
First Claim
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1. A field upgradeable security system for processing signals comprising:

  • an information processor having a receptacle for receiving a separate unitary replaceable security element;

    said replaceable security element including;

    means for generating a working key;

    means for encrypting said working key with a secret key; and

    means for communicating the encrypted working key to said information processor;

    wherein said information processor includes means for decrypting the encrypted working key for use in processing a signal.

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