【摘要】 为了保证IC卡中关键数据的安全,通常需要对关键数据进行加密处理。在笔者所开发的"计算机房计费管理系统"中,为了保证存放在IC中的上机费用的安全,对数据进行了加密处理,加密算法的设计思想是利用异或运算所具有的特点,首先对字节中的第三位和第六位进行交换,然后将整个字节与系统随机生成的一个六位数字进行连续异或运算,将运算后得到结果写入到IC卡中。更多还原

【Abstract】 For the security guarantee of key data in IC card,it is necessary to encrypt the key data usually.In the charging and administration system of computer rooms developed by the author,the data are processed by encryption for the security of the sum of money stored in IC card.Main idea of the encryption algorithm is to use the distinguishing feature of XOR.First of all,we exchange the 3rd and the sixth bit of the data byte,then a continuous XOR computation is executed randomly by using the total byte with a six-bits digit generation by system.Finally,the result of computation will be put into the IC card.更多还原