System and method for secure transfer of digital data to a local recordable storage medium
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United States of America Patent
Stats
-
Dec 11, 2001
Grant Date -
N/A
app pub date -
Feb 13, 1998
filing date -
Feb 13, 1998
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A device securely decrypts and writes an encrypted digital file to a local recordable storage medium. The device uses two decryption engines. The first decryption engine incrementally decrypts the encrypted digital file, which is then preprocessed and re-encrypted to form an intermediate file. The second decryption engine then incrementally decrypts the intermediate file and writes the decrypted results to a local recordable storage medium. Both decryption engines perform incremental decryption, such that substantially less than all of the digital file is in decrypted form at any instant. A device in accordance with a second embodiment includes a single decryption engine. The encrypted digital file includes individually encrypted portions, and the decryption engine incrementally decrypts the encrypted portions. These portions are buffered for subsequent writing to the recordable storage medium, but substantially less than all of the individually encrypted portions are stored in decrypted form at any instant.
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