JPS61211791A - Optical recording card - Google Patents

Abstract

PURPOSE:To keep secrecy of data by providing a memory for storing a key word for enciphering and decoding and a processor for processing the key word in a card body and enciphering a desired data by the key word to store in an optically recording area. CONSTITUTION:An original data a is supplied to an enciphering device 7 from an input terminal 10, at the same time enciphered by a key word (b) fed from an input terminal 1 to feed to an optical writing and reading section 8, and an optical recording area 5 of an optical card B is scanned and recorded by a strength modulated laser beam by an enciphered data (c). The key word (b) is written in a memory 4 through a processor 3 of the card B. When reading the data, a reproducing operation of the data and a pass-word is inputted, referring to a peculiar pass-word for the card stored in the processor 3, and both coincide, the optical reading and writing section 8 scans the optical area 5 by a non modulated laser beam to reproduce a data (c). The processor 3 reads the key word (b) from the memory 3 and supplies to a decoder 12 to decode the data (c) and obtain the original data (a).

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an optical recording card capable of optically recording data.

[Conventional technology]

Conventional cards for recording data include magnetic cards that use magnetic sheets as recording media, IC cards that use IC memory as recording media, and optical recording cards that use members that can optically write and read data as recording media. Various data cards have been proposed, including optical recording cards, which outperform other data cards in terms of recording capacity.

In other words, an optical recording card is provided with an optical recording area in which data can be written and read by optical means, and data can be written by scanning this optical recording area with a beam modulated with data. The data is read out by scanning the optical recording area in which the data is recorded with a beam of constant intensity. To write and read such data,
This can be done using a very thin laser beam, etc., and therefore the data recording density can be very high, and the recording capacity is very large compared to other data cards.

[Problem that the invention seeks to solve]

By the way, in such an optical recording card, it is very easy to read data from the optical recording area by using a suitable optical means, and it is also very easy to copy the data in the optical recording area.

As a result, data contents can be easily known to others, which poses a problem in terms of data confidentiality.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide an optical recording card that solves these problems and makes it possible to maintain data confidentiality.

[Means to resolve the problem]

For this reason, the present invention aims to maintain the confidentiality of the data by making it impossible to know the contents of the data even if the data is read out from the optical recording area or even if the data is copied. The card body is provided with a memory for storing keywords for encryption and decryption, and a processor for processing the keywords, and desired data is encrypted using the keywords and recorded in the optical recording area. It was designed to do so.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a configuration diagram showing an embodiment of an optical recording card according to the present invention, in which 1 is a card body, 2 is an external terminal, 3 is a processing device, 4 is a memory, 5 is an optical recording area, and 6 is a protection It is a layer.

In the figure, a card body 1 is provided with an optical recording area 5 in which data is recorded and a protective layer 6 that protects the optical recording area 5. This part is similar to a conventional optical recording card. Furthermore, a processing device 3 consisting of an IC chip and a memory 4 are fitted into the recess provided in the card body 1, and predetermined wiring is provided between them. An external terminal 2 is provided exposed on the surface of the processing device 1 , and wiring is also provided between the external terminal 2 and the processing device 3 .

The processing unit 3 consists of a processor, a nonvolatile memory storing a program for operating the processor, an input/output port, etc. The memory 4 is, for example, an erasable programmable read-only memory with a capacity of −4=8 bytes. - Non-volatile memory such as memory.

The data recorded in the optical recording area 5 is encrypted, and keywords for this encryption and decryption are stored in the memory 4.

Next, the data recording and reproducing operation of this embodiment will be explained using FIGS. 2 and 3. In addition, Figure 2 is a record system diagram,
FIG. 3 is a reproduction system diagram, in which 7 is an encryptor, 8 is an optical writing/continuation section, 9 is an interface, 10.11 is an input terminal, 12 is a decoder, and 13.14 is an output terminal. 1, and parts corresponding to those in FIG. 1 are given the same reference numerals. Also, with the broken line as the border, side A is the terminal device, and side B is the optical recording card.

First, in FIG. 2, when the optical recording card B is installed in the terminal A and a data recording operation is performed, the original data a is supplied from the input terminal 10 to the encoder 7, and at the same time, the input terminal 1
It is encrypted using the keyword b supplied from 1.

The encryption procedure is as follows: keyword b is an arbitrary bit pattern with a length of 128 bytes, an 8-bit parallel exclusive OR circuit is used as the encoder 7, and original data a is
It is divided into bytes and subjected to exclusive OR processing with keyword b to perform encryption. Encrypted data C is optically written.
The laser beam is supplied to the output section 8, and a laser beam whose intensity is modulated with this data C is generated. The above is the data recording process in terminal A.

The optical writing/reading unit 8 uses a laser beam to write the optical recording card B.
The optical recording area 5 is scanned, and the encrypted data C is recorded therein.

On the other hand, the keyword b is supplied to the processing device 3 of the optical recording card B via the interface 9, and written into the memory 4 after being subjected to predetermined processing. In this case, by providing the encryption circuit 7 with a function of holding the keyword b, the keyword b is repeatedly used to encrypt the original data a, which has a longer bit pattern length than the keyword b. , the keyword b is written into the memory 4 only once. Therefore, the capacity of the memory 4 can be reduced.

Note that clock pulses, power supply voltage, and the like are supplied from the terminal to the processing device 3, and data writing operations in the optical recording area 5 and keyword writing in the memory 4 are performed.

Next, when reading data from such an optical recording card, as shown in FIG. input.

On the other hand, the processing device 3 stores a unique password for each optical recording card, and checks this password against the password input at the terminal. This verification process is performed, for example, in a processing bag W (not shown) of the terminal A,
If the two do not match, data reproduction is not performed.

When the passwords match, the optical writing/continuation section 8 scans the optical recording area 5 with an unmodulated laser beam and reproduces the encrypted data C. Along with this, the processing device 3
reads keyword=7- from memory 4.

This keyword is supplied to the decoder 12 via the processing device 3 and the interface 9, and the data C is decoded.

Therefore, the original data a is obtained at the output terminal 13. The decoder 12 has a keyword holding means and an 8-bit parallel exclusive OR circuit, and performs exclusive OR processing on the reproduced data C every 128 bytes with the keyword b having a length of 128 bytes. As a result, original data a is obtained.

In this way, data is recorded and reproduced. Incidentally, in this embodiment as well, even if the password is unknown, data can be read or copied from the optical recording area using appropriate optical means. However, even if the data is read, since it is encrypted, the contents of this data cannot be known unless the keyword written in the memory 4 is known. Moreover, the keyword cannot be read unless the user knows the password. Therefore, the confidentiality of the data recorded in the optical recording area is sufficiently maintained.

In the above embodiment, since the keyword is written in the memory 4, the keyword from the input terminal 11 may have any bit pattern. On the other hand, keywords are stored in the memory 4 in advance,
When recording data, this keyword may be read out to encrypt the original data a, and when reproducing data, the reproduced data C may be decrypted using this keyword. In this case, a keyword is determined for each optical recording card, but no keyword generating means is required in the terminal.

In addition, in the above embodiment, the exclusive OR operation is used as the data encryption procedure, but this is not limited to this, and any other arbitrary encryption procedure can be used.
Procedure information indicating whether to decode or not may be written in the memory 4.

Furthermore, the above numerical values are merely examples, and the present invention is not limited thereto.

〔Effect of the invention〕

As explained above, according to the present invention, data can be encrypted and recorded in an optical recording area, and the keywords and decryption procedures necessary for reproducing data from the optical recording area and decoding the data are also provided. This is done by a means separate from the reading of the data, so even if data is read or copied from the optical recording area by a suitable optical means, the content of the data cannot be known, and therefore the data cannot be read. Confidentiality is significantly improved.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of an optical recording card according to the present invention, FIG. 2 is a block diagram showing a data recording system of this embodiment, and FIG. 3 is a block diagram showing a data reproducing system. 1... Card body, 2... External terminal, 3...
- Processing device, 4... Memory, 5... Optical recording area, 6... Protective layer.

Claims (1)

[Claims] An optical recording card equipped with an optical recording area in which desired data can be optically written and read, comprising: a nonvolatile memory that stores keywords for encrypting and decoding data; a processor that processes the keywords; and a processor that processes the keywords. and a non-volatile memory storing a processing program for processing the data, and according to the keyword, the desired data is encrypted and recorded in the optical recording area, and read from the optical recording area and encrypted. An optical recording card characterized in that the desired data can be decoded.