JP2006018335A5

JP2006018335A5 -

Info

Publication number: JP2006018335A5
Application number: JP2004192399A
Authority: JP
Filing date: 2004-06-30
Publication date: 2007-08-16

Claims

An interface for connecting external memory;
Random number generating means for generating random numbers;
Key generation means for generating a key used for encryption processing;
Encryption / decryption means for performing encryption / decryption based on the key generated by the key generation means;
Data processing means for reading and writing data to and from an external memory connected to the interface;
The key generation means generates a first key based on identification information unique to the external memory read from the external memory connected to the interface,
The encryption / decryption means encrypts the random number generated by the random number generation means using the first key to generate an encrypted random number,
The data processing means stores the encrypted random number in an external memory connected to the interface,
When storing the acquired content in an external memory connected to the interface,
The data processing means reads the unique identification information and the encrypted random number from the connected external memory,
The key generation means generates a second key based on the read identification information,
The encryption / decryption means generates the random number by decrypting the encrypted random number using the second key,
The key generation means generates a third key using the random number generated by the encryption / decryption means and the identification information read from the external memory,
The encryption / decryption means generates an encrypted content key by encrypting a content key used to encrypt content to be stored in the external memory using the third key,
The data processing means stores the encrypted content key in an external memory connected to the interface.
A terminal device characterized by the above.

The key generation means generates an identical common key as the key generated in the external memory by executing an authentication process with the external memory connected to the interface, and the encryption / decryption means generates The encrypted random number and the encrypted content key are further encrypted using the shared key, and the data processing means transmits the further encrypted encrypted random number and the encrypted content key to an external memory connected to the interface. The terminal device according to claim 1, wherein the terminal device is stored.

The encryption / decryption means encrypts the content encryption key and the input password using the third key when storing the content in an external memory connected to the interface. 2. The terminal device according to claim 1, wherein a key and an encrypted password are generated, and the data processing means stores the encrypted content key and the encrypted password in an external memory connected to the interface.

An interface for connecting external memory;
Random number generating means for generating random numbers;
Key generation means for generating a key used for encryption processing;
Encryption / decryption means for performing encryption / decryption based on the key generated by the key generation means;
Data processing means for reading and writing data to and from an external memory connected to the interface;
Before executing the process of storing the content in the external memory connected to the interface,
The key generation means generates a first key based on identification information unique to the external memory read from the external memory connected to the interface,
The encryption / decryption means encrypts the random number generated by the random number generation means using the first key to generate an encrypted random number,
The data processing means stores the encrypted random number in an external memory connected to the interface,
Further, when executing the process of storing the acquired content in an external memory connected to the interface,
The data processing means reads the unique identification information and the encrypted random number from the connected external memory,
The key generation means generates a second key based on the read identification information,
The encryption / decryption means generates the random number by decrypting the encrypted random number using the second key,
The key generation means generates a third key using the random number generated by the encryption / decryption means and the identification information read from the external memory,
The encryption / decryption means generates an encrypted content key by encrypting a content key used to encrypt content to be stored in the external memory using the third key,
The data processing means stores the encrypted content key in an external memory connected to the interface.
A terminal device characterized by the above.

The key generation means generates an identical common key as the key generated in the external memory by executing an authentication process with the external memory connected to the interface, and the encryption / decryption means generates The encrypted random number and the encrypted content key are further encrypted using the shared key, and the data processing means transmits the further encrypted encrypted random number and the encrypted content key to an external memory connected to the interface. The terminal device according to claim 4, wherein the terminal device is stored in the terminal device.

The encryption / decryption means encrypts the content encryption key and the input password using the third key when storing the content in an external memory connected to the interface. 5. The terminal device according to claim 4, wherein a key and an encrypted password are generated, and the data processing means stores the encrypted content key and the encrypted password in an external memory connected to the interface.