Data processor having BIOS decryption of emulated media images
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United States of America Patent
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Jul 29, 1997
Grant Date -
N/A
app pub date -
Sep 27, 1994
filing date -
Sep 27, 1994
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Multiple applications or versions of an application in different languages are distributed on a single mass storage medium, such as a CD-ROM. The BIOS is programmed to emulate different drives individually or simultaneously with data read from prescribed regions of the CD-ROM. To prevent access to unauthorized emulated images, each image is provided with an encryption key used as the seed to a pseudorandom number generator. Pseudorandom decryption of each block of data read from the CD-ROM is performed at the BIOS level only or at both the BIOS and application levels. For enhanced security, the algorithm decrypts each block of encrypted image data at a starting index that is pseudorandomly derived.
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