×

Encryption processing system

  • US 6,460,137 B1
  • Filed: 03/19/1996
  • Issued: 10/01/2002
  • Est. Priority Date: 06/02/1995
  • Status: Expired due to Term
First Claim
Patent Images

1. An encryption processing system in a service provider for distributing packets each containing a header and data to a service client, said data comprising software having a plurality of titles representing the software, said header having an ID provided with each title and time information previously provided with each packet which represents data for indicating a generation time of each packet, and said system comprising:

  • key generating means for randomly generating first and second keys for respective titles of the software in the data;

    a first encryption circuit encrypting input data with said first key;

    extracting means for extracting information comprising the ID and the time information from the header of each packet and inputting the ID and the time information to said first encryption circuit as an initial value of the input data to be initially encrypted;

    a second encryption circuit encrypting a value of a result of the encryption by said first encryption circuit with said second key and inputting a value of a result of this encryption to said first encryption circuit as the input data to be subsequently encrypted; and

    an exclusive OR circuit outputting an exclusive OR of the data stored in each packet and the value of the result of the encryption by said second encryption circuit.

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