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I remember there was a similar trick that hides data in GZip streams in its FCOMMENT block. Could something similar be done with DEFLATE? Allocate some unused
by est 6y ago
I remember there was a similar trick that hides data in GZip streams in its FCOMMENT block.
Could something similar be done with DEFLATE? Allocate some unused Huffman table? Put stuff in reserved bits?
- ekimekim 6y agoSpecifically with PNG it has a concept of "private" chunks which you can use to store arbitrary data. Conforming decoders will ignore these chunks, and may or may not drop them if the file is modified. See https://en.wikipedia.org/wiki/Portable_Network_Graphics#%22Chunks%22_within_the_file https://en.wikipedia.org/wiki/Portable_Network_Graphics#%22C...
- 082349872349872 6y agoA simple technique would be to use different block sizes.