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Use known start of the file for stored archives (hex): if your archiove contains only one encrypted file, and this file is stored (i.e. not compressed), using that option is a solution to get much better recovery speed. But you have to know from 1 to 4 bytes this file starts from. There are a lot of well-known signatures, though: for example, 'MZ' (hex: 4D 5A) for executable files, 'PK' (hex: 50 4B 03 04) for ZIP files, D0 CF 11 E0 (hex) for OLE compound documents (like MS Word/Excel files) etc.
Mask symbol: used for Mask attack.
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