發(fā)布時(shí)間：2018-11-19 20:24

【摘要】：目前各類二維碼應(yīng)用逐漸增多,隨之而來(lái)產(chǎn)生了二維碼信息安全性的困擾。如何保證二維碼數(shù)據(jù)的安全成為了一個(gè)關(guān)鍵性的問(wèn)題。以往通過(guò)在二維碼中寫入商品編號(hào)的方式進(jìn)行聯(lián)網(wǎng)數(shù)據(jù)驗(yàn)證已經(jīng)無(wú)法保證數(shù)據(jù)安全,任何人均可以通過(guò)偽造二維碼數(shù)據(jù)信息的方式來(lái)輕松仿制商用圖碼標(biāo)簽,因此需要考慮對(duì)二維碼信息進(jìn)行信息技術(shù)防偽,以達(dá)到難以被輕易破解和偽造的要求。本文提出一種基于商用密碼技術(shù)對(duì)商品信息進(jìn)行加密處理方法,使通過(guò)使用商密算法處理后的圖碼信息無(wú)法被普通識(shí)讀器進(jìn)行識(shí)別,防止其他人通過(guò)偽造數(shù)據(jù)生成加密防偽二維碼。提高了二維碼信息的安全性,保障了二維碼數(shù)據(jù)信息的完整性與可靠性。并針對(duì)拍攝圖像中二維碼易出現(xiàn)傾斜與形變的現(xiàn)象進(jìn)行分析,采用相關(guān)圖像處理技術(shù)進(jìn)行圖像預(yù)處理,使經(jīng)過(guò)矯正后的二維碼可被更好地識(shí)讀。本文主要研究?jī)?nèi)容和工作如下:1.針對(duì)因光照與拍攝角度引起的二維碼發(fā)生幾何形變情況進(jìn)行分析,采用形態(tài)學(xué)頂帽變換去除圖像陰影,并使用小波變換和光線增強(qiáng)來(lái)提高圖像對(duì)比度,根據(jù)二維碼的形狀特點(diǎn)來(lái)刪除圖像中無(wú)關(guān)區(qū)域。并提出基于相似度匹配來(lái)對(duì)二維碼的四個(gè)頂點(diǎn)進(jìn)行定位,根據(jù)二維碼頂點(diǎn)建立透視變換方程來(lái)對(duì)二維碼進(jìn)行矯正。提高圖碼識(shí)別幾率。2.采用國(guó)家商用密碼算法將二維碼信息進(jìn)行加密與計(jì)算數(shù)字簽名,通過(guò)數(shù)據(jù)加密來(lái)保證二維碼信息的安全性,通過(guò)數(shù)字簽名來(lái)保證二維碼信息來(lái)源無(wú)法偽造。并采用生成隨機(jī)數(shù)編號(hào)的方式來(lái)保證加密密鑰的唯一性,保證一次一密。難以被輕易破解與識(shí)讀。3.根據(jù)提出的二維碼信息加密處理方法設(shè)計(jì)專用的商密二維碼生成與識(shí)讀軟件,通過(guò)與普通識(shí)讀器識(shí)讀效果進(jìn)行對(duì)比。通過(guò)實(shí)驗(yàn)表明,通過(guò)本文加密方式生成的二維碼難以被普通識(shí)讀器正確識(shí)讀,保證了信息的安全性和抗偽造能力。顯示了二維碼防偽應(yīng)用的實(shí)用性。
[Abstract]:At present, the application of all kinds of QR codes is increasing gradually, which brings about the puzzlement of information security of QR codes. How to ensure the security of two-dimensional code data has become a key problem. In the past, online data verification by writing commodity numbers into the QR code could no longer guarantee data security. Anyone could easily copy the commercial code label by falsifying the data information of the QR code. Therefore, it is necessary to consider the anti-counterfeiting of information technology in order to achieve the requirement that it is difficult to be easily deciphered and forged. In this paper, a method of encrypting commodity information based on commercial cipher technology is proposed, which can not be recognized by common reader by using quotient encryption algorithm. Prevent others from generating encrypted anti-counterfeiting QR codes by falsifying data. The security of the two dimensional code information is improved, and the integrity and reliability of the two dimensional code data information are guaranteed. Based on the analysis of the phenomenon that the QR code is prone to incline and deformation in the photographed image, the image preprocessing technology is adopted to make the corrected QR code be read better. The main contents and work of this paper are as follows: 1. Based on the analysis of geometric deformation of two-dimensional code caused by illumination and shooting angle, morphological top hat transform is used to remove image shadow, and wavelet transform and ray enhancement are used to improve image contrast. According to the shape characteristics of the QR code, the irrelevant region in the image is deleted. Based on similarity matching, four vertices of two-dimensional code are located, and perspective transformation equation is established to correct the two dimensional code according to the vertex of two dimensional code. Increase the probability of code recognition. 2. The national commercial cipher algorithm is used to encrypt and calculate the two-dimension code information. The data encryption is used to ensure the security of the two-dimension code information, and the digital signature is used to ensure that the source of the two-dimensional code information can not be forged. The method of generating random number numbers is used to ensure the uniqueness of the encryption key and the security one at a time. Difficult to easily decipher and read. 3. According to the proposed method of encryption and processing of two-dimensional code information, a special quotient two-dimension code generation and recognition software is designed and compared with that of common reader. The experiments show that the QR code generated by the encryption method in this paper is difficult to be read correctly by the common reader, which ensures the security of information and the ability of anti-forgery. It shows the practicability of the anti-counterfeiting application of two-dimensional code.
【學(xué)位授予單位】：吉林大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TP391.44

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