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steghide: Notes 

apt install steghide

# steghide --help
steghide version 0.5.1

the first argument must be one of the following:
 embed, --embed          embed data
 extract, --extract      extract data
 info, --info            display information about a cover- or stego-file
   info        display information about 
 encinfo, --encinfo      display a list of supported encryption algorithms
 version, --version      display version information
 license, --license      display steghide's license
 help, --help            display this usage information

embedding options:
 -ef, --embedfile        select file to be embedded
   -ef         embed the file 
 -cf, --coverfile        select cover-file
   -cf         embed into the file 
 -p, --passphrase        specify passphrase
   -p        use  to embed data
 -sf, --stegofile        select stego file
   -sf         write result to  instead of cover-file
 -e, --encryption        select encryption parameters
   -e []|[]  specify an encryption algorithm and/or mode
   -e none               do not encrypt data before embedding
 -z, --compress          compress data before embedding (default)
   -z                  using level  (1 best speed...9 best compression)
 -Z, --dontcompress      do not compress data before embedding
 -K, --nochecksum        do not embed crc32 checksum of embedded data
 -N, --dontembedname     do not embed the name of the original file
 -f, --force             overwrite existing files
 -q, --quiet             suppress information messages
 -v, --verbose           display detailed information

extracting options:
 -sf, --stegofile        select stego file
   -sf         extract data from 
 -p, --passphrase        specify passphrase
   -p        use  to extract data
 -xf, --extractfile      select file name for extracted data
   -xf         write the extracted data to 
 -f, --force             overwrite existing files
 -q, --quiet             suppress information messages
 -v, --verbose           display detailed information

options for the info command:
 -p, --passphrase        specify passphrase
   -p        use  to get info about embedded data

To embed emb.txt in cvr.jpg: steghide embed -cf cvr.jpg -ef emb.txt
To extract embedded data from stg.jpg: steghide extract -sf stg.jpg
#

Example: Extract file embeded in jpeg1.jpeg file with passphrase "password123"

# steghide extract -sf jpeg1.jpeg -p "password123"
wrote extracted data to "a.txt".
# cat a.txt
pinguftw

Example: Extract file embeded in white_rabbit_1.jpg file without passphrase

# steghide extract -sf white_rabbit_1.jpg
Enter passphrase:
wrote extracted data to "hint.txt".

Practice

>>> THM | CC: Steganography

>>> THM | Wonderland

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