How Can I embed the length of my secret message in the special bytes of the cover image

How Can I embed the length of my secret message in the special bytes of the cover image

[DGM]

If you need to do low-level editing of the file, you can use fopen() fseek(), fread(), etc.

In order to have a more specific answer than that, you'll need a more specific question. What is the file format? Where exactly are you trying to cram metadata? How much metadata is there?

Answer 1

[yanqi liu]

yes，sir，may be use base64 to encode message，and use lsb method to embed the string into image matrix