Secure file transfer system and method

Details Secure file transfer system and method Secure file transfer system and method

1992-08-05

1994-03-22

Swann, Tod R.

Cryptography

Key management

Having particular key generator

380 21, 380 48, 380 25, H04L 900

Patent

active

052972089

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.

REFERENCES:
patent: 4322576 (1982-03-01), Miller
patent: 4432287 (1983-12-01), Zeidler
patent: 4933971 (1990-06-01), Bestock et al.
patent: 5117458 (1992-05-01), Takaragi et al.
patent: 5121429 (1992-06-01), Guppy et al.
patent: 5161194 (1992-11-01), Ujiie

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