×

Communication network for encrypting/deciphering communication text while updating encryption key, a communication terminal thereof, and a communication method thereof

  • US 6,307,940 B1
  • Filed: 06/25/1998
  • Issued: 10/23/2001
  • Est. Priority Date: 06/25/1997
  • Status: Expired due to Term
First Claim
Patent Images

1. A communication method for encrypting and transmitting a communication text, said communication method comprising the steps of:

  • a sender sequentially generating pseudo-random numbers based on a common key secretly shared with a receiver;

    creating a new encryption key each time a newly created first certain amount of pseudo-random numbers are generated by removing the first certain amount of an oldest pseudo-random numbers from a previously-created second certain amount of pseudo-random numbers and adding the newly-created first certain amount of pseudo-random numbers, and updating the encryption-key; and

    encrypting and transmitting the communication text using the updated encryption key.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×