Studies on Steganography using image or audio data

隐写术是一种信息安全技术，其安全性是通过隐藏某些数据（我们称之为虚拟数据）中存在的秘密信息来实现的。我们提出了一种隐写技术，称为bpcs -隐写，其信息隐藏容量可达虚拟数据的50%。在本研究中，我们考虑了bpcs -隐写术的应用，并制作了这些应用的原型软件。研究的具体内容和结果如下：一种以彩色图像作为虚拟数据的隐写技术和电子邮件的原型软件：我们制作了在Windows上运行的原型软件，嵌入和提取操作简单。在研究之前，我们做了一些有缺陷的软件。该原型软件改进了存在的问题，稳定运行。一种使用音频数据作为虚拟数据的隐写技术：我们提出了一种使用大小或幅度或虚拟数据的嵌入方法。虚拟数据使用WAV文件格式。我们还制作了隐写的原型软件。一种利用印刷图像作为虚拟数据的隐写技术：我们提取了嵌入在印刷图像中的秘密信息。具体步骤如下。首先，我们将秘密信息嵌入到计算机上的虚拟图像中。虚拟图像被打印在一张名片大小的塑料板上。利用扫描仪对打印图像进行扫描，提取秘密信息。上述第三个主题是与bpcs隐写术相关的未来研究中最有趣的领域。如果嵌入容量变大，则可以将该方法应用于许多工业应用。

Steganography is a information security technique, which security is realized to hide the existence of secret information in some other data (we call it a dummy data). We have proposed a steganographic technique, which is called BPCS-Steganography, which information hiding capacity can be as large as 50% of the dummy data. In the present research, we consider the applications of BPCS-Steganography and make the prototype software for those applications. Detailed items of the research and its results are the following.1. A steganographic technique that uses color images as the dummy data and the prototype software for email:We have made the prototype software that works on Windows and has easy operations in embedding and extracting. Before the research, we had made the software having some bugs. The prototype software is improved the problems and stable.2. A steganographic technique that uses audio data as the dummy data:We have proposed a embedding method that uses the size or the amplitude or the dummy data. WAV file format is used for the dummy data. We have also made the prototype software for the steganography.3. A steganographic technique that uses printed images as the dummy data:We have extracted the secret information embedded into printed image. Detailed steps are the following. First, we embed the secret information into the dummy image on the computer. The dummy image is printed out on a plastic board which is just business card in size. The printed image is scaned by scanner and then the secret information is extracted.The above third topic is the most interesting area in the future reseaches in connection with BPCS-Steganography. It is possible to apply the method to many industrial applications if the embedding capasity becomes larger.