On-car-data recording apparatus and in-train-image data managing system

• US 10,237,069 B2
• Filed: 01/06/2014
• Issued: 03/19/2019
• Est. Priority Date: 01/06/2014
• Status: Active Grant

• Current Assignee: Mitsubishi Electric Corporation
• Original Assignee: Mitsubishi Electric Corporation
• Inventors: Morimoto, Kazunari
• Primary Examiner(s): Do, Khang
• Application Number:
  US15/108,064
• Publication Number:
  US 20170005799A1
• Time in Patent Office: 1,898 Days
• CPC Class Codes: B61L 15/0072 On-board train data handling
• CPC Class Codes: B61L 15/0081 On-board diagnosis or maintenance
• CPC Class Codes: B61L 15/0094 Recorders on the vehicle
• CPC Class Codes: G06F 21/64 Protecting data integrity, e.g. using checksums, certificates or signatures
• CPC Class Codes: G09C 1/00 Apparatus or methods whereby a given sequence of signs, e.g. an intelligible text, is transformed into an unintelligible sequence of signs by transposing the signs or groups of signs or by replacing them by others according to a predetermined system cryptographic typewriters G09C3/00
• CPC Class Codes: H04L 9/0897 involving additional devices, e.g. trusted platform module [TPM], smartcard or USB
• CPC Class Codes: H04L 9/321 involving a third party or a trusted authority
• CPC Class Codes: H04L 9/3247 involving digital signatures

Abstract

An on-car-data recording apparatus mounted on a train to record image data, which is data of a video or an image photographed by an image pickup apparatus set in the train, including: a secret-key retaining unit that retains a secret key paired with a public key for electronic signature for which certification by a certification authority is completed, a train-specific-information managing unit that manages information specific to the own train capable of specifying a traveling position of the own train, an electronic-signature generating unit that integrates, the image data and the information managed by the train-specific-information managing unit, calculates a hash value of obtained integrated data, and generates an electronic signature on the basis of the calculated hash value and the secret key, and an image data managing unit that retains the generated electronic signature and the image data used in generating the electronic signature in association with each other.

Claims

1. An on-car-data recording apparatus mounted on a train to record image data, which is data of a video or an image photographed by an image pickup apparatus set in the train, the on-car-data recording apparatus comprising:

a storage device that retains a secret key paired with a public key for electronic signature for which certification by a certification authority is completed;

wherein the on-car-data recording apparatus is configured to;

manage information specific to the own train, wherein the information specific to the own train is based on a relationship between a formation number of the train and an identification of at least one crew member associated with the train, wherein the relationship provides traveling position of the own train;

integrate, every time the image data is generated by the image pickup apparatus, the generated image data and information specific to the own train, which is the information managed by the on-car-data recording apparatus, calculate a hash value of obtained integrated data, and generate an electronic signature on the basis of the calculated hash value and the secret key; and

retain the electronic signature generated by the on-car-data recording apparatus and the image data used in generating the electronic signature in association with each other,

wherein the on-car-data recording apparatus, at timing when the electronic signature is generated, is configured to acquire the information specific to the own train and determine the relationship between the formation number of the train and the identification of the at least one crew member associated with the train.

2. The on-car-data recording apparatus according claim 1, wherein the information specific to the own train further includes any one of a train number, identification information of a motorman, information concerning a traveling route, and information concerning a traveling section.

3. The on-car-data recording apparatus according claim 1, wherein the information specific to the own train further includes two or more of a train number, identification information of a motorman, information concerning a traveling route, and information concerning a traveling section.

4. An in-train-image data managing system comprising:

an on-car-data recording apparatus mounted on a train to record image data, which is data of a video or an image photographed by an image pickup apparatus set in the train; and

a ground apparatus set on a ground to determine presence or absence of alteration for the image data recorded by the on-car-data recording apparatus,

wherein the ground apparatus is configured to;

generate a public key and a secret key used in an electronic signature on the image data, request a certification authority to certify the generated public key, and pass the secret key to the on-car-data recording apparatus;

manage an electronic certificate issued to the public key by the certification authority; and

determine, on the basis of the electronic certificate, presence or absence of alteration for the image data recorded by the on-car-data recording apparatus, and

the on-car-data recording apparatus is configured to;

acquire the secret key from the ground apparatus and retain the secret key;

manage information specific to the own train, wherein the information specific to the own train is based on a relationship between a formation number of the train and an identification of at least one crew member associated with the train, wherein the relationship provides traveling position of the own train;

integrate, every time the image data is generated by the image pickup apparatus, the generated image data and information specific to the own train, which is the information managed by the on-car-data recording apparatus, calculate a hash value of obtained integrated data, and generate an electronic signature on the basis of the calculated hash value and the secret key; and

retain the electronic signature generated by the on-car-data recording apparatus and the image data used in generating the electronic signature in association with each other,

wherein the on-car-data recording apparatus, at timing when the electronic signature is generated, is configured to acquire the information specific to the own train and determine the relationship between the formation number of the train and the identification of the at least one crew member associated with the train.

5. The in-train-image data managing system according to claim 4, wherein the ground apparatus acquires any one image data retained by the on-car-data recording apparatus and an electronic signature associated with the image data and the information specific to the own train managed by the on-car-data recording apparatus, compares a hash value of integrated data obtained by adding the information specific to the own train to the acquired image data and a hash value restored on the basis of the acquired electronic signature and the electronic certificate and determines presence or absence of alteration for the acquired image data.

6. The in-train-image data managing system according to claim 4, wherein the information specific to the own car further includes any one of a train number, identification information of a motorman, information concerning a traveling route, and information concerning a traveling section.

7. The in-train-image data managing system according to claim 4, wherein the information specific to the own car further includes two or more of a train number, identification information of a motorman, information concerning a traveling route, and information concerning a traveling section.