基于二级定位的编码信道信息隐藏算法

doi:10.3969/j.issn.1000-436X.2013.12.014

Abstract

Abstract:

Based on analysis of existing information hiding algorithms and capacities in coding channel,the defects of those existing algorithms were pointed out,and an improved information hiding algorithm with capacity upper limit analysis and based on twice positioning was proposed.the proposed algorithm,the information hiding capacity upper limit is firstly computed before embedding,and used for comparison with the size of hiding secret data.Then,twice posi-tioning scheme and cyclic shift mechanism for choosing the embedding position were used in the proposed algorithm.Simulation results show that,compared with those existing algorithms,the proposed algorithm is able to avoid the risk of exposure of the secret channel caused by capacity exceeding of hiding data.It can not only improve the randomness of the embedding position,but also avoid the risk of overlap among different secret data.The hiding performances of the coding channel information hiding system are improved.

Key words: information hiding, coding channel, twice positioning, cyclic shift

Li-quan CHEN,Miao LU,Ai-qun HU,Xiao-yan SUN. Improved information hiding algorithm based on twice positioning in coding channel[J]. Journal on Communications, 2013, 34(12): 120-130.

Figures/Tables 17

p_e	E_b/N₀
p_e	0	1	2	3	4	5	6	7
$P_{e}^{1}$	0.091 9	0.067 8	0.039 9	0.024 1	0.013 8	0.005 7	0.002 2	0.000 98
$P_{e}^{2}$	0.008 4	0.007 5	0.006 15	0.004 51	0.002 25	0.001 20	0.000 8	0.000 02
$P_{e}^{3}$	0.003 21	0.002 82	0.001 97	0.001 23	0.000 56	0.000 11	0.000 01	0.000 002

p_e	E_b/N₀
p_e	0	1	2	3	4	5	6	7
$P_{e}^{1}$	0.078 1	0.060 0	0.036 8	0.022 8	0.013 9	0.006 1	0.001 5	0.000 86
$P_{e}^{2}$	0.008 3	0.007 4	0.006 2	0.004 82	0.002 41	0.000 91	0.000 28	0.000 03
$P_{e}^{3}$	0.001 08	0.000 31	0.000 08	0	0	0	0	0

仿真参数	具体参数值
载体信息	768 KB lenna.jpg
信道编码方式	(63,30,6)BCH
信道编码分组数	$N = ⌈ \frac{768 \times 1024 \times 8}{30} ⌉ = 209715$
编码后的信源信息长度	$C = 63 \times N = 63 \times ⌈ \frac{768 \times 1024 \times 8}{30} ⌉ = 13212045$
秘密信息	Xh_2.jpg(2 KB)Xh_19.jpg(19 KB)
纠错编码方式	(15,7,4) RS(15,7,4) RS
编码后的秘密信息长度	$M_{1} = ⌈ \frac{2 \times 1024 \times 8}{7} ⌉ \times 15 = 35100$ $M_{2} = ⌈ \frac{19 \times 1024 \times 8}{7} ⌉ \times 15 = 333525$
嵌入比率	Ratio₁=0.002 7Ratio₂=0.025 0

References 10

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[5]	王晓飞 . 基于信道编码的信息隐藏技术研究[D]. 哈尔滨：哈尔滨工业大学， 2009. WANG X F . Research on Channel Coding Based Information Hiding Techniques[D]. Harbin:Harbin Institude of Technology, 2009.
[6]	王天宇，刘玉君，唐冬明等. 基于 RS 码的有扰信道信息隐藏技术的研究[J]. 信息工程大学学报， 2004,5(3):85-88. WANG T Y , LIU Y J , TANG D M , et al. Study of information hiding based on RS code in noise channel technology[J]. Journal of Informa-tion Engineering University, 2004,5(3):85-88.
[7]	王伟祥，刘玉君，李文雄 . 利用LDPC 码实现信道编码信息隐藏技术[J]. 信息工程大学学报， 2006,7(1):49-50,53. WANG W X , LIU Y J , LI W X . Implementation of information hiding tech-nology in channel coding using low-density parity-check code[J]. Journal of Information Engineering University, 2006,7(1):49-50,53.
[8]	YAN X H , GUAN S , NIU X M . Research on the capacity of er-ror-correcting codes-based information hiding[A]. International Con-ference on Intelligent Information Hiding and Multimed Signal Processing[C]. Harbin,China, 2008.1158-116.
[9]	HARMSEN J J , PEARLMAN W A . Capacity of steganographic channels[J]. IEEE Transactions on Information Theory, 2009,55(4):267-273.
[10]	CHEN L Q , LU M , CHEN J B . Researches and simulations of infor-mation hiding in alamouti transmission system[A]. The Seventh Inter-national Conference on Computational Intelligence and Security[C]. Sanya,China, 2011.593-597.

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算法	预防机制	定位方法	循环移位
文献[3]	无	小波域嵌入	无
文献[4]	提出了容量分析模型	无	无
文献[5]	建立了容量分析模型	单次定位	无
文献[6]	无	单次定位	无
二级定位算法	建立容量分析模型，并运用到具体算法中	二级定位，更灵活准确	带循环移位机制，防止秘密信息相关覆盖

算法	存储开销
算法	密钥数	伪随机序列数
二级定位算法	1	2
原有算法	R	R

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Improved information hiding algorithm based on twice positioning in coding channel

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