Device and Program for Ciphering Data

• US 20080028012A1
• Filed: 04/24/2007
• Published: 01/31/2008
• Est. Priority Date: 10/27/2005
• Status: Active Grant

• Current Assignee: Hitachi Astemo Ltd. (Hitachi, Ltd.)
• Original Assignee: Hitachi Automotive Systems Limited (Hitachi, Ltd.)
• Inventors: Ando, Eriko, Fukuzawa, Yasuko, Kato, Hiromitsu
• Granted Patent: US 8,375,074 B2
• Time in Patent Office: Days
• US Class Current: 708/250
• CPC Class Codes: G06F 21/72 in cryptographic circuits
• CPC Class Codes: H04L 2209/84 Vehicles
• CPC Class Codes: H04L 9/0662 with particular pseudorandom sequence generator
• CPC Class Codes: H04L 9/0869 involving random numbers or seeds

Abstract

A terminal to be connected to a network has: a data acquisition unit for acquiring first data from the network; an extraction unit for extracting second data regarding a physical quantity in accordance with the first data; a random number generation unit for generating a random number in accordance with the second data; and an enciphering unit for enciphering the first data in accordance with the random number. The terminal has further a counter unit for counting the number of the first data, wherein the random number generation unit generates a random number in accordance with the second data or a value counted by the counter unit.

Claims

1. A terminal to be connected to a network, comprising:

a data acquisition unit for acquiring first data from said network;

an extraction unit for extracting second data regarding a physical quantity in accordance with said first data;

a random number generation unit for generating a random number in accordance with said second data; and

an enciphering unit for enciphering said first data in accordance with said random number.

2. The terminal according to claim 1, wherein said data acquisition unit holds an ID of said first data, and acquires said first data in accordance with said ID.

3. The terminal according to claim 1, further comprising a counter unit for counting the number of said first data, wherein said random number generation unit generates a random number in accordance with said second data or a value counted by said counter unit.

4. The terminal according to claim 1, wherein:

the terminal is mounted on a vehicle;

said network is installed in said vehicle to interconnect apparatus in said vehicle;

said second data is running information or control information of said vehicle; and

said first data is data obtained by packing the running information or control information of said vehicle.

5. The terminal according to claim 1, wherein said extraction unit extracts a bit string corresponding to a storage position of said second data from said first data, and extracts said second data by converting said bit string by using a predetermined conversion formula.

6. The terminal according to claim 1, further comprising correspondence information between identification information of said second data, identification information of said first data, a storage position of said second data in said first data, a data length of said second data, and a conversion formula for converting a bit string in said first data into said second data, wherein said extraction unit extracts a bit string corresponding to a storage position of said second data from said first data by referring to said correspondence information, and extracts said second data by converting said bit string by using a conversion formula and by referring to said correspondence information.

7. A terminal to be connected to a network, comprising:

a data acquisition unit for acquiring first data from said network;

a counter unit for counting the number of said first data;

a random number generation unit for generating a random number in accordance with a value counted by said counter unit; and

an enciphering unit for enciphering said first data in accordance with said random number.

8. A program executable by a computer, comprising:

a data acquisition program module having a portion of acquiring first data from a network;

an extraction program module having a portion of extracting second data regarding a physical quantity in accordance with said first data;

a random number generation program module having a portion of generating a random number in accordance with said second data; and

an enciphering program module having a portion of enciphering said first data in accordance with said random number.

9. The program according to claim 8, further comprising a counter program module having a portion of counting the number of said first data, wherein said random number generation program module has a portion of generating a random number in accordance with said second data or a value counted by said counter program module.

10. A program executable by a computer, comprising:

a data acquisition program module having a portion of acquiring first data from a network;

a counter program module having a portion of counting the number of said first data;

a random number generation program module having a portion of generating a random number in accordance with a value counted by said counter unit; and

an enciphering program module having a portion of enciphering said first data in accordance with said random number.