| 可变可视密码 |
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| 引用本文： | 乔明秋,赵振洲. 可变可视密码[J]. 密码学报, 2020, 7(1): 48-55 |
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| 作者姓名： | 乔明秋 赵振洲 |
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| 作者单位： | 北京政法职业学院信息技术系,北京102628;北京政法职业学院信息技术系,北京102628 |
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| 基金项目： | 北京政法职业学院科研项目(KY201917)。 |
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| 摘 要： | 传统的可视密码在加密时会产生像素扩张,结果使分存图像比秘密图像大许多倍,尤其是应用在灰度和彩色图像上,其扩张的倍数更是惊人.传统的可视密码都是单点加密,本文在Hou的m点加密的基础上,提出任意点加密可视密码,即在加密的时候可以对任意个点进行加密,我们称之为可变可视密码.操作的时候,对秘密图像的r个点同时进行加密,当r=m时,该加密就是像素不扩展可视密码;当r>m时,该加密得到的就是分存图像缩小的可视密码(r的增大会降低解密图像的对比度);当r
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| 关 键 词： | 可视密码 秘密共享 多点加密 可变可视密码 |
Variable Visual Cryptography |
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| QIAO Ming-Qiu,ZHAO Zhen-Zhou. Variable Visual Cryptography[J]. , 2020, 7(1): 48-55 |
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| Authors: | QIAO Ming-Qiu ZHAO Zhen-Zhou |
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| Affiliation: | (IT Department,Beijing College of Politics and Law,Beijing 102628,China) |
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| Abstract: | Conventional visual cryptography needs to expand pixels and enlarge the size of shares.This situation is more serious for gray-level and color images.Conventional visual cryptography is single-pixel encryption.Based on Hou's m-pixel encryption,this study proposes a visual cryptography of any pixel encryption,which is called variable visual cryptography(VVC).When computing the shares,r pixels of the secret image are encrypted all together.If r=m,the encryption is the visual cryptography without expanding the pixels;if r>m,the encrypted image is smaller than the shared image(the increase of r will reduce the contrast of the decrypted image);if r
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| Keywords: | visual cryptography secret sharing multi points encode variable visual cryptography(VVC) |
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