Samsung S50 HAMA IrDA Driver
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Samsung S50 HAMA IrDA Driver
Such a ticket allows fraudulent duplication because of the nature of electronic data. Accordingly, it is conceivable to be increasingly necessary to prevent acts of performing multiple accesses by use of a fraudulently duplicated ticket hereinafter referred to Samsung S50 HAMA IrDA multiple uses. Although such fraudulent acts must be eliminated, the ticket in the present invention is a piece of electronic data, and it is difficult to prevent the multiple uses of the duplicated ticket only by means of a software unit.
Therefore, it is understood that elimination of the above-described fraudulent acts Samsung S50 HAMA IrDA depend on hardware to some extent. However, a security device implemented in hardware has a limitation in hardware resources allocatable for this purpose. For this reason, with regard to conventionally used security devices, it is also conceivable that data for preventing the fraudulent acts must be stored in an area outside the security device.
In this case, it is possible to execute complicated encryption processing between the security device and the external area. However, such processing may cause response delays in Samsung S50 HAMA IrDA and may damage efficiency of using electronic tickets.
On the other hand, a method of storing the data for preventing fraudulent acts in the external area has a disadvantage of damaging reliability of the security device itself due to fraudulent accesses to the data for preventing the fraudulent acts. A method of storing an encryption key in an encrypted format outside the security device has Samsung S50 HAMA IrDA heretofore known.
However, it is hard to say that the method sufficiently addresses a question of restricting the number of signatures, i.
In this case, it is also conceivable to add a counter to a key Blob. However, reliability of the counter must be assured at the same time. Accordingly, adoption of a data format in which the counter is simply added is not sufficient in terms of eliminating the fraudulent multiple uses. The following document is considered: In this case, it is essential to validate whether this token is reliable. Accordingly, a key issued by Samsung S50 HAMA IrDA certificate site should be retained in the hardware.
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However, to assure safe storage of this key involves additional complexity and a new threat to reliability. In other words, it has been Samsung S50 HAMA IrDA deemed necessary to impart highly reliable number identification capability to data such as digital tickets which require prevention of fraudulent uses. Moreover, it has been deemed necessary to prevent fraudulent uses of data such as tickets with high reliability only by adding minimum hardware resources.
MC updated every time a signature processing step is Samsung S50 HAMA IrDA, and a counter array resister CIR for storing a hash value calculated from a counter array stored outside and a value in the above-described MC. The present invention also provides an information processing device for restricting multiple uses of signed data. The present invention also provides a controlling method for controlling a security device Samsung S50 HAMA IrDA restricting multiple uses of signed data.
The controlling method may further cause the security device to execute the step of storing the immediately preceding hash value among the hash values generated in the past and sent from the counter array. Moreover, in the present invention, the controlling method may further cause the security device to execute the step of allowing the hash function unit to read a value in the counter and to calculate the hash value which is a concatenated value obtained by coupling the counter value with a value in the counter array.
The present invention also provides a ticketing system using a digital ticket. The information processing device may obtain and store the ticket from another information processing device and access the service terminal.
Fraudulent uses of data can be prevented effectively and highly reliably with minimum hardware resources. In this invention, a security device is configured with a validity check unit which includes a counter a master counter: MC updated every time a signature processing is executed, and a counter array resister CIR for storing a Samsung S50 HAMA IrDA value calculated from a counter array stored outside and a value in the above-described MC.
The validity check unit generates a Samsung S50 HAMA IrDA value which is a concatenated value obtained by concatenating a value in the counter array CA read out of external nonvolatile storage means with the newest MC value.
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This hash value is compared with the value stored in the CIR. If Samsung S50 HAMA IrDA values are not identical to each other, it is apparent that the CA is changed irrespective of the signature processing. Accordingly, if the hash value and the CIR value are not identical to each other, the security device will not issue an instruction for calling up signature function means and processing through a digital signature will Samsung S50 HAMA IrDA stopped inside the security device, thereby preventing a fraudulent use.
In addition, the CA value can be read out of the external nonvolatile storage means.
Accordingly, it is possible to deal with a plurality of signature keys without worrying about memory resources of the security device. Specifically, the present invention provides a security device for restricting multiple uses of signed data, which includes: The validity check unit may further include key means for assuring validity of the security device, and an immediately preceding hash value among hash values generated in the past and sent from the counter array.
Here, the hash function unit further reads a value in the counter and calculates the hash value which is a concatenated value with a value in the counter array. The security device in the present invention includes a unit for comparing Samsung S50 HAMA IrDA generated hash value with the immediately preceding hash value. Moreover, the security device executes a digital signature in response to a judgment of the validity by the validity check unit, updates a signature number counter, and causes the external Samsung S50 HAMA IrDA storage unit to write an updated value in the signature number counter.
The present invention also provides an information processing device having a function for restricting multiple uses of signed data, which includes: Here, the controlling method causes the security device to execute the steps of: