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- This zip file should contain the following files:-
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- adult6.asm
- adult6.com
- adult6.doc
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-
- 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.
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- 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).
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- 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!!
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- 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.
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- The input value was changed to a constant value of '0dh' and that was that!
- See assembler code for comments.
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- Nice try Mr Smith! I wonder what other delights you have for us?
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- Enjoy .. adult6.com....
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- :-)
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