Cryptography – Cryptanalysis
Patent
1990-03-26
1993-08-17
Cain, David
Cryptography
Cryptanalysis
380 23, 380 25, 380 19, 235380, G11B 2328
Patent
active
052376095
ABSTRACT:
A portable semiconductor memory device for interfacing with and exchanging information with an external terminal, said portable device having a security function for controlling access to a main memory. The main memory is adapted to exchange data with the external terminal by means of an interface bus which includes data lines, address lines and control lines. Access controls means in the portable unit is utilized to control access to the main memory. The unit also has a security memory comprising two sections. One section stores enciphered data which is read out to the external terminal, deciphered and returned to the unit as the first element used in a comparison. The second section of the security memory stores internal identification information. The two elements of identification information are provided to a comparator means which enables access to the main memory via the interface bus after a match is detected.
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Cain David
Mitsubishi Denki & Kabushiki Kaisha
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