steganoCode

Steganography in source code

usage: stego.py [-h] [--input INPUT] [--output OUTPUT] [--stdin] [--stdout] [--hide] [--showSource] [--showFound]
                [--lang LANG] [--message MESSAGE] [--comment COMMENT]

optional arguments:
  -h, --help         show this help message and exit
  --input INPUT      Input file
  --output OUTPUT    Output file
  --stdin            Read from stdin
  --stdout           Output to stdout
  --hide             Hide Mode
  --showSource       Show clean source
  --showFound        Show Matches
  --lang LANG        Programming Language
  --message MESSAGE  Hidden message
  --comment COMMENT  Comment

This tools encodes secret messages in a comment, which is appended at the start of the output

Encoding

The message is first commuted from unicode to binary and then to a sequence of these two invisible unicode characters:

• U+200F RIGHT-TO-LEFT MARK for binary digit 1
• U+200E LEFT-TO-RIGHT MARK fot binary digit 0

The last char in the sequence is always ignored in decoding and is U+200F RIGHT-TO-LEFT MARK (to restore the correct reading order that the previous char would impart) A comment is created, accounting for the programming language and placed at the top of the output. The comment contains the message payload followed optionally by a text comment

Decoding

Every sequence of the two designated chars is stored and decoded.

if showSource is enabled, then the source output contains the original message in the comments where it appears if showFound is enabled, the output contains all the decoded instances

example