文档介绍：图片中信息的隐藏与还原方法探索
摘要
随着信息技术、网络技术、电子商务的迅速发展,网络信息安全将全方位地危及社会的经济、政治和文化等方面。随着计算机硬件的迅速发展,具有并行计算能力的破解技术日益成熟。仅通过增加加密算法的密钥长度来达到增强安全性已不再是唯一的可行方法。但对信息隐藏而言,可能的监测者或非法拦截者则难以从公开信息中判断机密信息是否存在,难以截获机密信息。
本论文将密码编码学和信息隐藏技术相结合,并通过人眼的视觉冗余来实现对24位位图图片文件的信息隐藏和还原。本系统是基于Windows XP环境下,通过Visual C++。经测试结果表明:通过该最低有效位(LSB)算法,能够实现在一副比如(40×40,)的24位位图中隐藏600个字节的信息,并且,图片隐藏信息的能力与它自身的大小成正比。而通信双方只能在输入正确密钥的情况下才能从载体图片中提取出正确的秘密信息;否则得到的将是一堆乱码。从而表明,将密码编码学和信息隐藏相结合使得秘密信息的通信得到了更高的安全的保障。
关键词:信息安全;加密算法;信息隐藏;感觉冗余;最低有效位(LSB)
The Design of Information Hiding and Recovering in Image Files
Abstract
With the rapid development of information technology, network technology and merce, network information security will endanger the society such as economic, political and cultural fields, and so on. With the rapid development puter hardware, nowadays puters with puting ability can crack information more and more easily. It is not the only option which to increase the key length of encryption algorithm in order to enhance security. On information hiding, it is difficult for the potential monitor or illegally interceptor to judge whether the confidential information exists in the open information or not.
This bined cryptography and information hiding technology, meanwhile through the seeing redundancy of eyes of mankind to achieve the hiding and recovering of 24 bitmap image files. The system is based on Windows XP and developed through Visual C + + for development tool. The Experiments mend that the least-significant-bit(LSB) algorithm, can achieved such a (40 × 40. ) 24 bits hidden in bitmap 600 bytes of information, Moreover, the ability of hidden information is proportional to the size of picture. The tow sides munication who get the correct key can get the correct secret information from the Photo; otherwise, will be the piles of distortion.
So we can see that bination of cryptography and information hiding makes munication of information much more securely.
Key words: Information security; E