Writing area security system

摘要

A writing area security system (10) includes a CPU (34), a flash memory (64), and a memory controller (62). The memory controller (62), when receiving a read command of data stored in the flash memory (64) from the CPU (34), performs a parity check on the data. The memory controller (62) outputs the data to the CPU (34) only when the parity of the read data is correct.

主权项

1. A writing area security system including a storage having a predetermined writing area, a controller controlling writing to and reading from said storage, and a host to be connected to said controller, wherein
said host includes an instruction transmitter which transmits a reading instruction of data stored in said predetermined writing area to said controller, and said controller includes
a format determiner which determines whether or not the data read from said predetermined writing area in response to said reading instruction is in a predetermined format, andan outputter which outputs said data to said host only when said format determiner determines that said data is in said predetermined format, wherein said storage has a first area and a second area, said controller further includes a first writer which writes data to said first area in a writable mode to which a transition is made in response to a first transition command issued by a server for downloading data to said host, and said format determiner determines only with respect to data read from said second area as said predetermined writing area whether or not said data is in the predetermined format, wherein said server includes an encrypter which encrypts said first transition command.