| 在数字印章中嵌入信息的方法及其实现 |
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| 引用本文： | 蔡宗吟,梁荣,周庆.在数字印章中嵌入信息的方法及其实现[J].计算机工程与应用,2012,48(12):78-82. |
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| 作者姓名： | 蔡宗吟 梁荣 周庆 |
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| 作者单位： | 1.乐山师范学院 智能信息处理及应用实验室，四川 乐山 614000
2.大连理工大学 管理学院，辽宁 大连 116012
3.重庆大学 计算机学院，重庆 400044 |
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| 基金项目： | 国家自然科学基金（No.61003246） |
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| 摘 要： | 提出了一种在数字印章图像中的圆环上嵌入信息的方法，以实现文档认证的目的。分析了Bresenham圆序列的各种性质，提出了两个具体的圆环信息嵌入算法，分析了它们的嵌入量和平均形变量。第一个算法仅在圆环的外圆中嵌入数据，其形变较小；第二个算法同时在外圆和内圆中嵌入信息，使信息嵌入量增大了一倍。实验与分析表明，两种算法的平均形变量均小于1像素，其嵌入效果也令人满意。此外，两种算法在普通大小的数字印章中可分别嵌入HMAC-SHA512认证码和1 024比特的RSA签名结果。
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| 关 键 词： | 数字印章 数字水印 信息嵌入 数字签名 |
Method to embed information to electronic seals |
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| CAI Zongyin
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LIANG Rong
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ZHOU Qing.Method to embed information to electronic seals[J].Computer Engineering and Applications,2012,48(12):78-82. |
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| Authors: | CAI Zongyin LIANG Rong ZHOU Qing |
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| Affiliation: | 1.Lab of Intelligent Information Processing and Application, Leshan Normal University, Leshan, Sichuan 614000, China
2.School of Management, Dalian University of Technology, Dalian, Liaoning 116012, China
3.College of Computer Science, Chongqing University, Chongqing 400044, China |
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| Abstract: | This paper presents a method to embed information in digital image of seal for the purpose of document authentication.The properties of sequences generated by Bresenham circle-drawing algorithm are investigated.Two algorithms to embed information in rings of seal image are proposed and their embedding capacity and distortion are analysed.The first one embeds data in outer circle of the ring and has a smaller distortion;the second one embeds data in inner and outer circles of the ring whose embedding capacity is double as that of the first algorithm.The distortion of two algorithms is satisfactory for common users and both of them have average distortion of less than 1 pixel.Moreover,a seal image with common size can accommodate the outputs of HMAC-SHA512 and RSA digital signature by two algorithms. |
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| Keywords: | electronic seal digital watermarking information embedding digital signatures |
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