Computer security guard circuit
作者： Thomas C. Muehleisen
DOI:
关键词:
摘要: A circuit (16) is designed to prevent unauthorized access a remote device such as computer (10) over communications system telephone network (12). terminal (13) connected the (12) through conventional modem (14). At location of (10), between and another (15). Circuit also receive signal therefrom which connects (15) temporarily same. The connection, however, disconnected after predetermined time period unless receives second from before expiration that period.
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