Secure file transfer system and method
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United States of America Patent
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-
Mar 22, 1994
Grant Date -
N/A
app pub date -
Aug 5, 1992
filing date -
Aug 5, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
This invention is a system and method for securely and robustly transferring a file from one computer to another without having a prearranged encryption key. Data is transferred by first generating some random numbers on each computer and undertaking some cryptographically secure handshaking in which a session key is determined. Then the file is broken up into blocks and encrypted with a chaining block cipher and transmitted. The blocks have headers which identify the them, and allow for detection and correction of transmission errors. Before retransmitting a block, an initialization vector is sent to synchronize the cipher modules. The random numbers are generated with keystroke timings combined with a pseudorandom number generator to expand the supply.
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