http://darkside.com.au/snow/

[snow-log] The SNOW Home Page


Whitespace steganography

The program SNOW is used to conceal messages in ASCII text by
appending whitespace to the end of lines. Because spaces and tabs are
generally not visible in text viewers, the message is effectively
hidden from casual observers. And if the built-in encryption is used,
the message cannot be read even if it is detected.

What's in a name?

SNOW exploits the Steganographic Nature Of Whitespace. Locating
trailing whitespace in text is like finding a polar bear in a snow
storm (which, by the way, explains the logo). And it uses the ICE
encryption algorithm, so the name is thematically consistent.

It's free!

As of 16 June 2013, SNOW is available under an Apache 2.0 licece. The
usual conditions apply, but if you find SNOW useful for anything, the
author would love to hear about it.

Recent changes

Prior to 22 November 1998 the DOS version, contained in snowdos.zip,
had a bug affecting encryption. Files concealed with encryption using
the DOS version could not be decrypted by the other versions, and
vice versa. The bug was caused by bit-shifting of 16-bit variables in
DOS. This has now been fixed.

The source version, when compiled under Unix, also had a bug where it
could not read data concealed by the DOS version, owing to the
carriage return character appended by DOS. This has also been fixed
as of 22 November 1998.

  * Documentation
      + How it works
      + Manual page
      + About the logo
  * Download source
      + snow-20130616.tar.gz (16210 bytes)
      + snow.zip (22071 bytes)
  * Download DOS/Windows executable
      + 16-bit executable snwdos16.zip (27001 bytes)
      + 32-bit executable snwdos32.zip (30961 bytes)
  * Download Java 1.1 version
      + Java source jsnow.zip (10691 bytes)
      + Java classes jsnow.jar (24039 bytes)
  * Java 1.1 applet
      + Download source, classes, and doco jsnowapp.zip (35117 bytes)
      + Run the applet (Note - needs Java 1.1 browser)
  * Examples
      + Dr Rick Perry's interactive CGI script for concealing/
        extracting messages in HTML pages.
  * About the author


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                 Document last modified by Matthew Kwan, 20 June 2013
     Please send any comments or corrections to mkwan@darkside.com.au