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Research on Spatial Steganography Techniques Based on Digital Image Object Contours

Author: Xia
Tutor: HuanFei
School: Shanghai Jiaotong University
Course: Computer technology
Keywords: Steganography Key Exchange Contour Extraction Public Channel
CLC: TP309.7
Type: Master's thesis
Year: 2012
Downloads: 52
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Abstract


Traditional encrypted communication is mostly based on cryptography, but encrypted communication usually shows up as unreadable codes, which draws attention of attackers to hack or sabotage the information, thus damage security of communication. Steganography achieve the goal of protecting important information through hiding the existence of both sides of communication and the secret information, and is widely studied these years.Existing Steganography methods normally embed encrypted secret information into cover information without changing general attributes of cover information, and then publish the‘combined’information on public Web sites. Due to the openness of cover information and imperceptibility of secret information, only the real communicators know the existence of secret information, thus will draw no suspicion. However, sender and receiver have to arrange embedding and encryption method through keys, thus key exchange is an unavoidable problem. Potential attacker can monitor the key exchange channel to acquire the evidence of existence of secret communication, thus weaken the security of Steganography. How to embed both keys and secret information into cover materials simultaneously and transmit through overt channel is an important issue.This paper raises a spatial Steganography method based on digital image object contours. We introduce key exchange ideas of the traditional cryptology into Steganography, and achieve key exchange through public key algorithm. We also combine encryption key with object contours within the image to reduce the amount of key that needs to embed into the cover, this combination enhanced the stability of key. Through this method, key and secret message can be transmitted through public channel simultaneously. This paper mainly accomplished the following tasks:1. Introduce line-segment detection method into colored image segmentation to raise an object contour extraction algorithm, which do not need parameter tuning, on colored digital images. This is fundamental step of key hiding;2. Design an algorithm that combine encryption key with the relatively stable object contour region, thus ensure the simultaneously transmit of both keys and secret information;3. Taking possible stega-analysis and noise disturbance due to unreliable transmit channel into account, we make several modifications to current spatial Steganography to handle these problems. Experiments confirm the effectiveness and robustness of our algorithm.

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CLC: > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > General issues > Security and confidentiality > Encryption and decryption
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