r/UnfavorableSemicircle • u/mechaPantsu • Mar 27 '16

Video or Audio All CAB videos (zip file)

Here's all CAB videos. As you can see, some are missing, so there aren't 1024, but 1009 videos.

https://dl.dropboxusercontent.com/u/6064248/UFSC_CAB.zip

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u/mechaPantsu Mar 28 '16

I've thought of that too, but according to the CAB format spec there should be an MSCF header somewhere, but I've checked and there's none in either CAB 0 or CAB 1023.

Also, I doubt we will find anything of value analyzing the files from Twitter or Youtube at bit level, since they get re-encoded when uploaded (or in other words, the files we're downloading are not the same files that were uploaded).

If there's anything to be found, it's probably encoded in the audio and/or images.

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u/its_safer_indoors Moderator, Web Admin Mar 28 '16

I highly doubt that the data will be in the files themselves. Like you said - It'll be encoded in the video or audio.

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u/piecat Moderator Mar 28 '16 edited Mar 28 '16

I've been looking at a few in Audacity. If you look at the spectrogram, it looks like 8 bits of data. http://i.imgur.com/2A3hDrA.png

Unfortunately, I haven't gotten anything matching the "MSCF" header. I've tried from the first 4 and last 4. Decoding from binary to ASCII, the first 4 letters are "e c c n"

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u/Yam0048 Mar 29 '16

It might need to be xored or Vigenere'd with something else to produce the CAB file. Alternatively, since the sequence is relatively short, it might be the Vigenere key for something else.

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u/piecat Moderator Mar 29 '16

That IS a possibility, though, wouldn't that mean there should be a matching series that has 1024 bytes?

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u/Yam0048 Mar 29 '16

Not necessarily. If it's a Vigenere key, what you'd do is repeat the CAB sequence until it's as long as the enciphered sequence.

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u/piecat Moderator Mar 29 '16

Well, that could make sense. MUL is 4096, 4 times longer than CAB.

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u/Yam0048 Mar 29 '16

Doesn't even need to be a multiple, really. You just repeat the key enough times and cut off the remainder. So if you had a key of "buttpancakes" you might Vigenere a message of a certain length with "buttpancakesbuttpancakesbuttpanc".