Steganography for Radio Amateurs - A DSSS Based Approach for Slow Scan Television

摘要

In 2005, Germany introduced a new Amateur Radio Ordinance prohibiting encrypted radio traffic at home. Crypto-bans can be circumvented using steganography. However, present steganographic methods are not eligible because the embedded message will not survive the usual distortions in a radio transmission. Robust as current water-marking methods are, they leave clearly detectable traces and have a smaller capacity. This paper presents measures that improve the robustness of steganographic communication with respect to non-intentional, random channel errors and validates their effectiveness by simulation. For the scenario of a radio communication, we determine practicable parameters for least detectability under six different short wave conditions. The resulting method embeds messages with a length of up to 118 bytes in a narrow-band Slow Scan Television connection in Martin-M1 mode.