Data security device and method thereof

Details Data security device and method thereof Data security device and method thereof

1996-07-03

1999-07-27

Palys, Joseph E.

Electrical computers and digital processing systems: support

Multiple computer communication using cryptography

Protection at a particular protocol layer

G06F 1100

Patent

active

059283610

ABSTRACT:
In a data security system, after completion of writing into a P-ROM, a switching circuit is open to thereby disconnect the connection between an internal bus and an external bus. In this state, it is impossible to read the contents out of the P-ROM. To read the contents, a protection releasing terminal is brought to "H". This causes a switching circuit to conduct to make possible read-out. The "H" signal is simultaneously supplied to an erasion signal generating circuit to erase a part selected by an erasion selecting switch. Secrecy is substantially maintained because a program in the P-ROM is not entirely read. The remainder except the erased portion can undergo checking for correctness of writing.

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