pngsecret

Hide messages in PNG images. Encodes data with subtle transparency changes.

Install

Make sure that Go is installed and your PATH includes GOBIN. Then run the following:

$ go get -u github.com/evantbyrne/pngsecret

Note: The $ at the beginning of newlines in this document represents the bash shell prompt, and is not a part of the actual commands.

Usage

$ pngsecret
usage: pngsecret [<flags>] <command> [<args> ...]

Hide messages in PNG images.

Flags:
  --help  Show context-sensitive help (also try --help-long and --help-man).

Commands:
  help [<command>...]
    Show help.

  decode <file_in>
    Decode a message.

  encode <file_in> <file_out> <message>
    Encode a message.

Add a secret message to a PNG:

$ pngsecret encode cat.png totally-normal-cat-picture.png "Hello, World"

Decode a PNG:

$ pngsecret decode totally-normal-cat-picture.png
Hello, World