You will often need to store some uncompressed information in a compressed file. Information about the compressed data (length, flags, etc.) is usually uncompressed. Integers within the header may contain a 0x00 because of an unused high order byte, and flags often use 0 as the default value. You can usually count on a header being at the beginning of the file, so you will probably find a few 0x00's at the beginning of a compressed file, and because there may be additional headers for additional compressed blocks throughout the file, there will not be a random distribution of 0x00's throughout the file.

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

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