Information storage device
This encryption magnetic disk device can use a user password and a manufacture password as access restriction passwords. An encoding processing unit can encrypt user data, and a decoding processing unit can decrypt the encrypted user data. When its lock is canceled by a user password, the encryption magnetic disk device outputs the user data in a plain text. When its lock is canceled by a manufacturer password, the encryption magnetic disk device encrypts and outputs user data.
1 . An information storage device capable of restricting an access to recorded data by setting a password, comprising:
a manufacturer password storage unit for storing manufacturer passwords;
a user password storage unit for storing user passwords;
a user password registration unit for recording inputted user passwords in the user password storage unit; and
a user data output unit for outputting user data recorded in a record medium in a cryptogram when an inputted password coincides with a manufacturer password stored in the manufacturer password storage unit and outputting user data recorded in the record medium in a plain text when an inputted password is recorded in the user password storage unit.
2 . The information storage device according to claim 1 , wherein
the manufacturer password storage unit and user password storage unit are provided in the same storage medium.
3 . The information storage device according to claim 2 , wherein
the storage medium in claim 2 is the record medium as in claim 1 .
4 . The information storage device according to claim 1 , wherein
the manufacturer password storage unit and user password storage unit are provided in separate storage media.
5 . The information storage device according to claim 1 , wherein
the encryption key is recorded in the record medium.
6 . The information storage device according to claim 1 , wherein
the manufacturing password, the user password and the encryption key are recorded in a specific area of the record medium.
7 . The information storage device according to claim 6 , wherein
the specific area is area for recording firmware of the record medium.
8 . The information storage device according to claim 1 , further comprising
an encryption key storage unit for storing encryption key,
wherein
when outputting the user data in a cryptogram, the user data output unit encrypts the user data recorded in the record medium, using an encryption key stored in the encryption key storage unit.
9 . The information storage device according to claim 8 , further comprising
an encrypting record unit for encrypting user data, using an encryption key stored in the encryption key storage unit and recording it in the record medium.
10 . The information storage device according to claim 1 , further comprising
an encrypting record unit for encrypting user data, using a first encryption key,
wherein
the user data output unit encrypts the user data using a second encryption key to generate the cryptogram
11 . The information storage device according to claim 10 , wherein
the first and second encryption keys are the same.
12 . The information storage device according to claim 11 , wherein
both the first and second encryption keys are recorded in the record medium.
13 . The information storage device according to claim 1 , further comprising
an encryption key storage unit for storing encryption key,
wherein
the user data output unit comprises
an encrypting processing unit for encrypting user data stored in a storage medium, using an encryption key read from the encryption key storage unit; and
a decrypting processing unit for decrypting encrypted user data stored in a storage medium into a plain text, using an encryption key read from the encryption key storage unit.
14 . The information storage device according to claim 13 , further comprising
an encrypting record unit for encrypting user data using an encryption key stored in the encryption key storage unit and recording it in the record unit.
15 . The information storage device according to claim 1 , wherein
the user data outputting unit comprises
an encrypting processing unit for encrypting user data recorded in the record medium, using an encryption key externally inputted; and
a decrypting processing unit for decrypting encrypted user data recorded in a record medium into a plain text, using the encryption key.
16 . The information storage device according to claim 15 , further comprising
an encrypting record unit for encrypting user data, using an encryption key stored in the encryption key storage unit and recording it in the record medium.
17 . The information storage device according to claim 1 , further comprising
a manufacturer password recording unit for recording a manufacturer password in the record medium.
18 . The information storage device according to claim 1 , wherein
the manufacturer password is registered in a database possessed by a manufacturer manufacturing the information storage device.
19 . The information storage device according to claim 18 , wherein
each manufacturer password is related to each information storage device and is managed in the database.
20 . The information storage device according to claim 18 , wherein
each manufacturer password is related to each model of an information storage device and is managed in the database.