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Portable communications device with enhanced security

  • US 7,831,722 B2
  • Filed: 07/11/2007
  • Issued: 11/09/2010
  • Est. Priority Date: 07/30/1996
  • Status: Expired due to Fees
First Claim
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1. A portable communications device, comprising:

  • a host computerized device having an operating system;

    a network communications interface adapted to communicate with a network and said host computerized device;

    a security card adapted to be received at least partly within said host computerized device, said security card having portions comprising user-specific and cryptographic data stored therein, at least said portions being protected against access by unauthorized users;

    a first computer program adapted to dynamically obtain at least one identifier for said portable communications device when said communications interface is placed in data communication with said network;

    a second computer program adapted to establish security association between said portable communications device and a security device on said network, said second computer program comprising a key exchange algorithm adapted to cause said portable communications device and said security device to exchange cryptographic keys while establishing said association; and

    a third computer program adapted to seal or encrypt data sent from said portable communications device using at least one of said cryptographic keys;

    wherein said key exchange algorithm includes the generation and transmission of a random number by only one party to the security association.

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