March 2017
Intermediate to advanced
262 pages
5h 26m
Chinese
Content preview from 物联网设备安全
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46
｜
第
2
章
是
100
，提前量是
50
，那有效的钥匙编码值是
100
～
150
的一个整数。每当插入有
效卡时，门锁把自身的钥匙编码重置成门卡的值。通过这种方式，门锁钥匙编码增
加以确保较旧的门卡失效。注意，代表主钥匙的具体钥匙编码也存储在门锁中。酒
店用不同的主钥匙编码来分割不同的区域，使得仅有某些锁能够用酒店指定的主钥
匙卡打开。
站点代码（
site code
）值是由
Onity
随机分配的唯一的
32
位随机值，采用站点代码来加
密
24
位钥匙编码，以便确认酒店财产。如果这个值被破解，便能造出任意磁卡开锁，
也能给门锁重新设置（如后文所述）。
站点代码实际使用的加密算法在
Cody Brocious
的白皮书附录
B
中。
除了这里所述的典型钥匙卡之外，该系统还包括编程卡和备用卡。当刷过编程卡后再刷
备用卡，那么备用卡就成了这道门的客人门卡了。这些卡是当编码器（用来制作客人门卡）
出现故障时使用的。编程卡也是用站点代码值加密的，然而备用卡是没有加密过的。当（用
编程卡）制作一批备用卡时，每张卡的识别码都依次递增。
客人将卡插入门锁，利用站点代码解密卡上的数据。下一步，检查是否在有效期内。最后，
检查钥匙编码，如果在提前量范围内就能打开门锁。
2.1.3
编程端口
锁的右下角有一个编程端口，该端口也用作直流电源适配器接口。在安装门锁和更换门
锁电池时，会导致存储被重置，这时可用一个便携的编程器（
PP
）给门锁编程。安装时，
PP
用来配置锁的识别码和钥匙编码。
PP
也能用来连接门锁并发出指令，如提供正确的站点代码来开锁。
PP
还可以通过编程端口读取锁的存储区。 ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.