File encryption method and file cryptographic system
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United States of America Patent
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Aug 10, 1993
Grant Date -
N/A
app pub date -
Mar 12, 1991
filing date -
Mar 13, 1990
priority date (Note) -
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Abstract
In an information processing system having an upper rank apparatus and an external storage device which performs transmission and reception of data between the storage device and the upper rank apparatus, at least one of encryption and decryption of the data by use of an algorithm controlled by a desired data key is performed in the external storage device, while generation, encryption and decryption of the data key are performed on the upper rank apparatus side. By this configuration, the burden of the upper rank apparatus is largely reduced and the secrecy of data stored in the external storage device can be surely kept without spoiling the throughput of the whole system.
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