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    • 10. 发明专利
    • STORAGE DEVICE
    • JPH0498553A
    • 1992-03-31
    • JP21651190
    • 1990-08-17
    • ASCII CORP
    • KINOSHITA MOTOYAKANEKO ITARUYAMASHITA RYOZO
    • G06F12/14G06F21/24G09C1/00
    • PURPOSE:To keep the secrecy of data by converting the stored 1st data into the 2nd data to store this data with the 3rd data and outputting the 1st data when the prescribed relations are secured in the prescribed frequency. CONSTITUTION:When the address information AD is supplied from a host com puter, a ROM 1 supplies the address contents shown by the AD to a random number generating circuit 5, etc., as the data D1. The circuit 5 generates sequen tially the random numbers synchronously with a clock signal CLKX and outputs these random numbers as the data D2. If a signal KEYINJ is equal to '1', the data D2 is obtained with the prescribe conversion applied to the data D1. A comparator 4 compares the D2 with the data D3 supplied from the host com puter and outputs a signal PM kept at '1' when the coincidence is secured between both data. Then the D1 is never outputted unless the signals PM of level '1' are outputted from the comparator 4 in the prescribed frequency.