zsteg: add page (#3959)

pages/common/zsteg.md

@@ -0,0 +1,29 @@
+# zsteg
+
+> Steganography detection tool for PNG and BMP file formats.
+> It detects LSB steganography, ZLIB-compressed data, OpenStego, Camouflage and LSB with the Eratosthenes set.
+> More information: <https://github.com/zed-0xff/zsteg>.
+
+- Detect embedded data in a PNG image:
+
+`zsteg {{path/to/image.png}}`
+
+- Detect embedded data in a BMP image, using all known methods:
+
+`zsteg --all {{path/to/image.bmp}}`
+
+- Detect embedded data in a PNG image, iterating pixels vertically and using MSB first:
+
+`zsteg --msb --order yx {{path/to/image.png}}`
+
+- Detect embedded data in a BMP image, specifying the bits to consider:
+
+`zsteg --bits {{1,2,3|1-3}} {{path/to/image.bmp}}`
+
+- Detect embedded data in a PNG image, extracting only prime pixels and inverting bits:
+
+`zsteg --prime --invert {{path/to/image.png}}`
+
+- Detect embedded data in a BMP image, specifying the minimum length of the strings to be found and the find mode:
+
+`zsteg --min-str-len {{10}} --strings {{first|all|longest|none}} {{path/to/image.bmp}}`