"zip" files fit your description quite nicely (I can't believe that having 20 of the first 29 bytes of a file be zero makes sense when you are trying to compress things -- like I said, they aren't doing the best compression they could).

The "gzip" files I checked had about 2 zero bytes in the first 10 bytes. This is much more reasonable in my book but also fits your description so...

I conceed the point; you are right. (:

        - tye (but my friends call me "Tye")

In reply to (tye)Re2: How to tell if something is encrypted by tye
in thread How to tell if something is encrypted by Sifmole

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