------Stepwise Multiple Regression-----
A 4am and san inc crack      2018-08-15
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Name: Stepwise Multiple Regression
Genre: educational
Year: 1980
Publisher: Belanger & Boyle
Platform: Apple ][+ or later
Media: 5.25-inch disk
Sides: 1
OS: DOS 3.3
Previous cracks: none

This disk was automatically cracked by
the development version of Passport
(dated 2018-08-14), using a new module
by qkumba that handles this protection.
It stores encryption keys in unused
bytes of each file's track/sector list,
which are then used by the RWTS to read
that file's sectors from disk. Each
file has its own keys, so we get to
parse the DOS 3.3 disk catalog on track
$11, follow each directory entry, make
a map of each sector's encryption keys,
and write out the unencrypted version.
Then we patch the RWTS to ignore the
encryption keys.

Here is the transcript:

                 --v--

Reading from S6,D1
T00,S00 Found DOS 3.3 bootloader
Gathering per-file encryption keys
Using disk's own RWTS
Writing to RAM disk
T00,S02,$80: A546 -> A900
T00,S02,$EE: A546 -> A900
Writing to S6,D2
Crack complete. Press any key

                 --^--

More information and source code is
available at
https://archive.org/details/Passport4am

Quod erat liberandum.

                   ~

            Acknowledgments


Thanks to qkumba for the Passport patch
module that gathers the per-file keys,
and thanks to cosmoza for the original
disk!

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A 4am and san inc crack        No. 1788
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