Hide (mostly) anything in plain sight.
- Handle several file types (audio, video, image, pdf)
- Can hide a string, a file and a folder
- Fileless (avoids writing to disk as possible)
- Encryption (AES 256 / ChaCha20-Poly1305)
Note
Folder content will be archived as zip files and embedded into the target file.
Contrary to the real steganography, (ab)using files metadata has some limits that may not exist with the LSB algorithm.
Hidden data size
Basically, the limit for storing hidden data will be the target file size itself.
So, if your target file size is 500 KB, you will then be able to store (hide) up to 500 KB of data into the target file.
The bigger the target file is, the more you can store (hide) data in it.
Tip
As a rule of thumb, the data that you want to store (hide) must be smaller than the target file that will hold it.
When testing if PDF files could be used as target file, I've discovered that only the description tag could be added but not the comment tag.
Note
I've then modified the code to handle this situation but depending on the target file format, the script might fail to write the required metadata tags.
Another limit is that the encrypted data can be seen while using an hexadecimal viewer like xxd.
Important
If that's a problem for you, you should then fallback on real steganography to conceal your secret data.
Usage: cloak.sh <file> <data | string> - Embed and Hide data in file.
Arguments:
-h | --help Print this help message
-d | --dump <file> Dump data from given file
-e | --extract <file> Extract data from given file
-k | --keep Keep original input file (don't replace it)
Examples:
* cloak.sh <file> Print file tags
* cloak.sh <file> <data | string> Embed and Hide data in file tags
* cloak.sh -d <file> Read given file tags and print hidden data
* cloak.sh -e <file> Read given file tags and extract hidden data
- Jiab77