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Storage device
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A storage device and storage technology, applied in computer security devices, preventing unauthorized use of memory, record carriers used by machines, etc., can solve problems such as high concealment, difficulty, and secret cracking
Inactive Publication Date: 2004-06-16
PANASONIC CORP
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Problems solved by technology
[0010] However, the above-mentioned method of comparing the inherent numbers becomes defenseless once the number is leaked
In addition, there is also the possibility of deciphering the secret by inputting a series of numbers in sequence
In addition, when the IC card is disassembled and analyzed by contacting the wiring with a probe, it is also difficult to maintain confidentiality.
[0011] Furthermore, in the case of encrypting data, since the concealment is determined according to the strength of the password, it may not be possible to obtain high concealment.
Method used
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Embodiment approach 1
[0048] figure 1 It is a block diagram showing the overall configuration of the IC card 100 according to the first embodiment.
[0049] In this figure, a microcomputer 110 (processor) includes a register 111 for taking in data read from a semiconductor storage unit 120 described later, and is obtained by dividing or multiplying a clock signal input from the outside. The clock signal is a device for controlling data input and output of the IC card 100 or various data processing. More specifically, by executing a program or the like stored in the semiconductor storage unit 120, data input from the outside is written into the semiconductor storage unit 120, or data read from the semiconductor storage unit 120 or data subjected to predetermined processing is sent to the outside. output.
[0050] The above-mentioned semiconductor storage unit 120 is used to store programs or various data executed by the microcomputer 110, and includes: a memory array unit 121, a sense amplifier 12...
no. 2 Embodiment approach
[0074] Hereinafter, an IC card according to Embodiment 2 will be described. In addition, in the following embodiments, components having the same functions as those in the first embodiment described above are denoted by the same reference numerals, and description thereof will be omitted.
Embodiment approach 2
[0075] The IC card of embodiment 2, such as Figure 5As shown, the difference from the IC card of Embodiment 1 above is that a data masking unit 224 is provided instead of the data masking unit 124 , and a random data generating circuit 231 is also provided.
[0076] The random data generating circuit 231 outputs a random data signal within a predetermined time.
[0077] In addition, the data masking unit 224, specifically, such as Figure 6 As shown, the selector 224a is configured to include a number corresponding to the number of bits of data.
[0078] According to the above constitution, for example, if Figure 7 As shown, starting from the data mask unit 224, when the data mask signal is at the H level, the data signal read from the memory array unit 121 is output in the same manner as in the first embodiment described above. On the other hand, when the data mask signal is at In the case of L level, the random data signal output from the random data generation circuit ...
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Abstract
A data mask section outputs memory data read from a memory array unit for a predetermined time period that is shifted from an edge timing of a clocksignal, while a microcomputer takes in the data output from the data mask section at the edge timing of the clocksignal. Thus, the microcomputer is capable of appropriately taking in the memory data only when the frequency of the clocksignal is within a predetermined range, and accordingly, it is difficult to fraudulently obtain the memory data. Furthermore, the data mask section may output random data, or the like, during a time period other than the predetermined time period. In such a case, it is difficult to analyze the memory data, and the confidentiality of the memory data is improved.
Description
technical field [0001] The present invention relates to a storage device such as an IC card having a semiconductor memory and a processor, and particularly to a technique for improving the privacy of data stored in the semiconductor memory. Background technique [0002] In recent years, the market for storage devices such as IC cards equipped with microcomputers and semiconductor storage units has rapidly expanded, and they have been used in various applications. [0003] In particular, applications for storing personal data or monetary data in IC cards and the like are also widespread. When used for such a purpose, the privacy of the data stored inside becomes an important aspect. [0004] On the other hand, for companies that manufacture or operate IC cards, it is often necessary to read and analyze internally stored data when developing IC cards or when IC cards shipped to the market fail. [0005] Therefore, it is sought to prevent malicious reading of data by a third ...
Claims
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Application Information
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