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Collection of Hack-Phreak Scene Programs
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cleanhpvac.zip
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cleanhpvac
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ADULT6.ZIP
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ADULT6.DOC
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Text File
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1995-05-31
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2KB
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46 lines
This zip file should contain the following files:-
adult6.asm
adult6.com
adult6.doc
-------------------------------------------------
Hello All,
YES, it is an ECM on the Adult card!..
And this is what they have done, and what I did to crack it.
The first thing noticed was the fact the the Digital Signature and
Check Sum status were reading OK (on the diagnositc text screen, adult5).
This meant that the first two sections (out of three) of hashing must
have been working correctly! (any change in the hashing and the 'dsig'
would have said '1' ie error).
The next point noticed was, while running Adult5.com for a while,
(up to an hour) a correct '78' answer packet was beening sent to the
decoder.....Yes..a picture for about 1 second out of 1 hour of watching!!
After two correct sessions (dont know how long but it felt like forever)
the answer packets were compaired. The result... both checksum bytes
(last byte in the '74' message) read 0Dh. Then looking at the existing
adult code, the only thing that could have been changed was the last
hashing input data byte value (was the value of the checksum byte).
This seemed correct by the fact that the signature read correct, as this
is tested before the last hashing.
The input value was changed to a constant value of '0dh' and that was that!
See assembler code for comments.
Nice try Mr Smith! I wonder what other delights you have for us?
Enjoy .. adult6.com....
:-)