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It's an old version of a logger developed in early days of ACS4.1 by ericdog.
The last version I used was 2.7 but that was five months ago and there were later versions about even then, so I'm sure others can expand on what little I know.
dlog was handy for studying the new commands and speculating about the nanos hidden under the new encryption. It also featured a nice timing attack which ascertained a key through which some interesting stuff could be done. The main thing you probably want to know was whether it's able to extract the equivaent of Ird1's PMK used to decrypt session key updates, or the HMK used to assign the PMK in the first place. The answer is no. Although early versions of Irdeto 2 overseas were compromised to some extent, no known flaws in 4.1 or the delta platform are public yet.
Back then most invasive experiments were geared toward EMM chid-add replays, but with only limited success because the signature algorithm was unknown.
Some custom interface hardware was also developed around that time which enabled selective interception of card commands and responses.
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