×

Secure data packet transmission system and method

  • US 4,944,006 A
  • Filed: 04/25/1989
  • Issued: 07/24/1990
  • Est. Priority Date: 03/12/1987
  • Status: Expired due to Fees
First Claim
Patent Images

1. In a data packet communication system having messages comprising a first data packet encrypted with a global encryption key and a second addressed data packet containing the binary address of a subscriber terminal and encrypted with an address encryption key;

  • a plurality of subscriber terminals each including memory means for storing a plurality of global decryption keys, an address decryption key and a binary address, the address decryption key and binary address uniquely identifying the individual subscriber terminal;

    means at each subscriber terminal for attempting to decrypt said second addressed data packet with said stored address decryption key; and

    means responsive to decryption of said second addressed data packet for comparing the binary address in said second addressed data packet with said binary address stored at said subscriber terminal.

View all claims
  • 3 Assignments
Timeline View
Assignment View
    ×
    ×