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目前在全国广泛使用的各种就餐卡,就外形而言绝大多数都符合ISO7816/2的标准,即标准的信用卡大小(85.5mm长、54.0mm宽、0.76mm厚)。就存储信息的形式而言,有磁卡、光电卡、条码条、IC卡等。顾名思义,磁卡利用覆着在卡片上的磁条记录信息;光电卡有两大类,通孔式光电卡和反射式光电卡,均是以一定的孔位编码存储信息;条码条目前也有两大类,即一维条码和二维条码,一维条码就是大家经常在超市商品上见到的条码,而二维条码是一种信息量大许多的条码信息存储形式;IC卡的信息存储与读取的形式最丰富,有普通存储IC卡、加密储存IC卡、含CPU卡及射频IC卡等,是目前发展最活跃的一种卡。在信息社会的今天,上述这些卡的使用均采取了不同程度和形式的加密技术。本文试图探讨一下这些加密技术的特点和优劣,以及各种加密技术的适用面。从形式上讲,加密技术可以分为三大类,即化学方法、物理方法和数学方法。各种防伪油墨,透光油墨
At present, the vast majority of dining cards that are widely used across the country, in terms of appearance, are in line with the standard of ISO7816 / 2, which is the standard credit card size (85.5 mm long, 54.0 mm wide and 0.76 mm thick). The form of storage of information, there are magnetic cards, optical cards, bar code, IC cards. As the name implies, the use of magnetic stripe card covered with magnetic stripe record information; optical card has two categories, through-hole optical card and reflective optical card, are encoded with a certain hole-bit information; bar code also has two major Type, that is, one-dimensional bar code and two-dimensional bar code, one-dimensional bar code is the bar code we often see in the supermarket goods, and two-dimensional bar code is a much larger amount of bar code information storage form; IC card information storage and read Take the most abundant form, there are ordinary storage IC card, encrypted storage IC card, CPU card and radio IC card, etc., is currently the most active development of a card. Today in the information society, the use of these cards has taken varying degrees and forms of encryption. This article attempts to explore the characteristics of these encryption techniques and advantages and disadvantages, as well as a variety of encryption technology for the face. Formally speaking, encryption technology can be divided into three categories, namely, chemical methods, physical methods and mathematical methods. A variety of security ink, light ink