Data transmission apparatus, data reception apparatus, and data transfer system

A data transmission apparatus that moves move-target data to a data reception apparatus, said data transmission apparatus comprising:

• an encrypting unit operable to encrypt the move-target data so as to generate encrypted data;
• a communication control unit operable to transmit the generated encrypted data to the data reception apparatus;
• an authentication and key exchange unit operable to perform authentication between said data transmission apparatus and the data reception apparatus, and to transmit an encryption key that has been encrypted to the data reception apparatus, only when the authentication is successful;
• a synchronous control unit operable to control an operation of transmission or reception of synchronization data, after the transmission of the encrypted data, the synchronization data synchronizing a timing of deleting or invalidating the move-target data in said data transmission apparatus and a timing of decrypting the encrypted data in the data reception apparatus, and the encrypted data being received by the data reception apparatus;
• and
• a data managing unit operable to delete or invalidate the move-target data, based on the operation by said synchronous control unit,
• wherein said synchronous control unit is operable to control the timing of decrypting the encrypted data in the data reception apparatus, by transmitting, to the data reception apparatus, a decryption key for decrypting the encrypted encryption key together with the synchronization data.

A data reception apparatus that receives move-target data from a data transmission apparatus, said data reception apparatus comprising:

• a communication control unit operable to receive encrypted data from the data transmission apparatus;
• a decrypting unit operable to decrypt the received encrypted data;
• an authentication and key exchange unit operable to perform authentication between the data transmission apparatus and said data reception apparatus, and to receive, from the data transmission apparatus, an encryption key that has been encrypted;
• and
• a synchronous control unit operable to control an operation of transmission or reception of synchronization data, after the reception of the encrypted data, the synchronization data synchronizing a timing of decrypting the encrypted data in said data reception apparatus and a timing of deleting or invalidating the move-target data in the data transmission apparatus,
• wherein said synchronous control unit is operable to receive, from the data transmission apparatus, a decryption key for decrypting the encrypted encryption key, together with the synchronization data, and to decrypt the encrypted encryption key using the decryption key, so that the encrypted data can be decrypted.

A data reception apparatus that receives move-target data from a data transmission apparatus, said data reception apparatus comprising:

• a communication control unit operable to receive encrypted data from the data transmission apparatus;
• an authentication and key exchange unit operable to perform authentication between the data transmission apparatus and said data reception apparatus, and to receive a first encryption key from the data transmission apparatus;
• a decrypting unit operable to decrypt the encrypted data using the received first encryption key;
• an encrypting unit operable to re-encrypt the decrypted data using a generated second encryption key, and to encrypt the second encryption key after re-encrypting the decrypted data;
• and
• a synchronous control unit operable to control an operation of transmission or reception of synchronization data, after the reception of the encrypted data, the synchronization data synchronizing a timing of decrypting the encrypted data in said data reception apparatus and a timing of deleting or invalidating the move-target data in the data transmission apparatus,
• wherein said synchronous control unit is further operable to transmit, to the data transmission apparatus, the synchronization data indicating that said data reception apparatus has received the encrypted data, after said data reception apparatus has received the encrypted data, and to decrypt the second encryption key so that the re-encrypted data can be decrypted, when said data reception apparatus receives the synchronization data from the data transmission apparatus.

A data transfer system comprising a data reception apparatus and a data transmission apparatus,

• wherein said data reception apparatus is a data transmission apparatus that moves move-target data to said data reception apparatus, said data transmission apparatus including:
• an encrypting unit operable to encrypt the move-target data so as to generate encrypted data;
• a communication control unit operable to transmit the generated encrypted data to said data reception apparatus;
• an authentication and key exchange unit operable to perform authentication between said data transmission apparatus and said data reception apparatus, and to transmit an encryption key that has been encrypted to said data reception apparatus, only when the authentication is successful;
• a synchronous control unit operable to control an operation of transmission or reception of synchronization data, after the transmission of the encrypted data, the synchronization data synchronizing a timing of deleting or invalidating the move-target data in said data transmission apparatus and a timing of decrypting the encrypted data in said data reception apparatus, and the encrypted data being received by said data reception apparatus;
• and
• a data managing unit operable to delete or invalidate the move-target data, based on the operation by said synchronous control unit,
• said synchronous control unit is operable to control the timing of decrypting the encrypted data in said data reception apparatus, by transmitting, to said data reception apparatus, a decryption key for decrypting the encrypted encryption key together with the synchronization data,
• said data reception apparatus is a data reception apparatus that receives the move-target data from said data transmission apparatus, said data reception apparatus including:
• a communication control unit operable to receive the encrypted data from said data transmission apparatus;
• a decrypting unit operable to decrypt the received encrypted data;
• an authentication and key exchange unit operable to perform the authentication between said data transmission apparatus and said data reception apparatus, and to receive the encryption key from said data transmission apparatus;
• and
• a synchronous control unit operable to control the operation of transmission or reception of the synchronization data, after the reception of the encrypted data, the synchronization data synchronizing a timing of decrypting the encrypted data in said data reception apparatus and a timing of deleting or invalidating the move-target data in said data transmission apparatus, and
• said synchronous control unit is operable to receive, from said data transmission apparatus, a decryption key for decrypting the encrypted encryption key, together with the synchronization data, and to decrypt the encrypted encryption key using the decryption key, so that the encrypted data can be decrypted.

A data transmission method for moving move-target data from a data transmission apparatus to a data reception apparatus, said data transmission method comprising:

• an encrypting step of encrypting the move-target data so as to generate encrypted data;
• a communication control step of transmitting the generated encrypted data to the data reception apparatus;
• an authentication and key exchange step of performing authentication between the data transmission apparatus and the data reception apparatus, and transmitting an encryption key that has been encrypted to the data reception apparatus, only when the authentication is successful;
• a synchronous control step of controlling an operation of transmission or reception of synchronization data, after the transmission of the encrypted data, the synchronization data synchronizing a timing of deleting or invalidating the move-target data in the data transmission apparatus and a timing of decrypting the encrypted data in the data reception apparatus, and the encrypted data being received by the data reception apparatus;
• and
• a data managing step of deleting or invalidating the move-target data, based on the operation in said synchronous control step,
• wherein said synchronous control step includes controlling the timing of decrypting the encrypted data in the data reception apparatus, by transmitting, to the data reception apparatus, a decryption key for decrypting the encrypted encryption key together with the synchronization data.

A data reception method for a data reception apparatus that receives move-target data from a data transmission apparatus, said data reception method comprising:

• a communication control step of receiving encrypted data from the data transmission apparatus;
• a decrypting step of decrypting the received encrypted data;
• an authentication and key exchange step of performing authentication between the data transmission apparatus and the data reception apparatus, and receiving, from the data transmission apparatus, an encryption key that has been encrypted;
• and
• a synchronous control step of controlling an operation of transmission or reception of synchronization data, after the reception of the encrypted data, the synchronization data synchronizing a timing of decrypting the encrypted data in the data reception apparatus and a timing of deleting or invalidating the move-target data in the data transmission apparatus,
• wherein said synchronous control step includes receiving, from the data transmission apparatus, a decryption key for decrypting the encrypted encryption key, together with the synchronization data, and decrypting the encrypted encryption key using the decryption key, so that the encrypted data can be decrypted.

A program for causing a computer to execute a data transmission method for moving move-target data from a data transmission apparatus to a data reception apparatus, the data transmission method including:

• an encrypting step of encrypting the move-target data so as to generate encrypted data;
• a communication control step of transmitting the generated encrypted data to the data reception apparatus;
• an authentication and key exchange step of performing authentication between the data transmission apparatus and the data reception apparatus, and transmitting an encryption key that has been encrypted to the data reception apparatus, only when the authentication is successful;
• a synchronous control step of controlling an operation of transmission or reception of synchronization data, after the transmission of the encrypted data, the synchronization data synchronizing a timing of deleting or invalidating the move-target data in the data transmission apparatus and a timing of decrypting the encrypted data in the data reception apparatus, and the encrypted data being received by the data reception apparatus;
• and
• a data managing step of deleting or invalidating the move-target data, based on the operation in said synchronous control step,
• wherein said synchronous control step includes controlling the timing of decrypting the encrypted data in the data reception apparatus, by transmitting, to the data reception apparatus, a decryption key for decrypting the encrypted encryption key together with the synchronization data.

A program for causing a computer to execute a data reception method for a data reception apparatus that receives move-target data from a data transmission apparatus, the data reception method including:

• a communication control step of receiving encrypted data from the data transmission apparatus;
• a decrypting step of decrypting the received encrypted data;
• an authentication and key exchange step of performing authentication between the data transmission apparatus and the data reception apparatus, and receiving, from the data transmission apparatus, an encryption key that has been encrypted;
• and
• a synchronous control step of controlling an operation of transmission or reception of synchronization data, after the reception of the encrypted data, the synchronization data synchronizing a timing of decrypting the encrypted data in the data reception apparatus and a timing of deleting or invalidating the move-target data in the data transmission apparatus,
• wherein the synchronous control step includes receiving, from the data transmission apparatus, a decryption key for decrypting the encrypted encryption key, together with the synchronization data, and decrypting the encrypted encryption key using the decryption key, so that the encrypted data can be decrypted.

A computer-readable medium having a computer program recorded thereon, the computer program for moving move-target data from a data transmission apparatus to a data reception apparatus, and causing a computer to execute;

• an encrypting step of encrypting the move-target data so as to generate encrypted data;
• a communication control step of transmitting the generated encrypted data to the data reception apparatus;
• an authentication and key exchange step of performing authentication between the data transmission apparatus and the data reception apparatus, and transmitting an encryption key that has been encrypted to the data reception apparatus, only when the authentication is successful;
• a synchronous control step of controlling an operation of transmission or reception of synchronization data, after the transmission of the encrypted data, the synchronization data synchronizing a timing of deleting or invalidating the move-target data in the data transmission apparatus and a timing of decrypting the encrypted data in the data reception apparatus, and the encrypted data being received by the data reception apparatus;
• and
• a data managing step of deleting or invalidating the move-target data, based on the operation in said synchronous control step, and
• wherein said synchronous control step includes controlling the timing of decrypting the encrypted data in the data reception apparatus, by transmitting, to the data reception apparatus, a decryption key for decrypting the encrypted encryption key together with the synchronization data.

A computer-readable medium having a computer program recorded thereon, the computer program for a data reception apparatus that receives move-target data from a data transmission apparatus, and causing a computer to execute;

• a communication control step of receiving encrypted data from the data transmission apparatus;
• a decrypting step of decrypting the received encrypted data;
• an authentication and key exchange step of performing authentication between the data transmission apparatus and the data reception apparatus, and receiving, from the data transmission apparatus, an encryption key that has been encrypted;
• and
• a synchronous control step of controlling an operation of transmission or reception of synchronization data, after the reception of the encrypted data, the synchronization data synchronizing a timing of decrypting the encrypted data in the data reception apparatus and a timing of deleting or invalidating the move-target data in the data transmission apparatus, and
• wherein said synchronous control step includes receiving, from the data transmission apparatus, a decryption key for decrypting the encrypted encryption key, together with the synchronization data, and decrypting the encrypted encryption key using the decryption key, so that the encrypted data can be decrypted.