Digital Signing and Encrypting for Personal Use
Posted by Mr. IT Guy | Filed under Featured, Howto, IT in General
Digital signing and encryption has been used to authenticate emails in many corporate environment to prevent spoofing. Here’s a simple guide to create a digital signature, import them and use them for personal use. My current choice of personal certificate is issued by Thawte. Thawte’s root certificate has been installed on most computer; therefore the recipient do not need to install custom root certificate to confirm the authenticity.
The first thing that needs to be done is obtaining digital certificate. Thawte’s personal digital certificate can be obtained here. After registration and verification, you can create your own certificate. The default options will allow both digital signing and encryption. Thawte also allows you to create multiple certificate for multiple accounts. Download, import and usage instructions available after the jump. Read the rest of this entry »
Tags: backup, digital signature, email, Linux, mac, Mac OSX, Microsoft, security, tools, windows
Triple Boot Mac OS X, Ubuntu and Windows XP on MacBook Pro Core 2 Duo (Part 3)
Posted by Mr. IT Guy | Filed under Featured, Hardware, Linux, Mac OSX, Microsoft, Networking Product, Operating System, Review
Out of the three parts, this is the part where I stumble upon the most “unexpected” issues. First of all, Live CD does not work on my 2nd-gen Macbook Pro (MBP). There seems to be some problem with the ATI drivers on the Live CD that prevents X from starting up. I have to use the Alternate CD with the text-based-installer. Also, GRUB will not install. Fortunately LILO will be offered and it installs just fine. Finally X will not work after the reboot and you need to install some drivers before it will work.
Tags: Linux, mac, Mac OSX, macbook pro, Microsoft, os x, ubuntu, windows
Sub Class C Subnet Reverse DNS - Bind9
Posted by Mr. IT Guy | Filed under Featured, Howto, IT in General, Linux
Having your ISP delegating the reverse DNS maybe a YMMV scenario. Some will allow you and others will not. If your ISP does allow you to host your own reverse DNS you have to create a zone file for the reverse DNS entry. This is a very easy thing to do if you have a class C subnet, but anything smaller than that or with different IP ranges, it gets complicated. Here’s what they usually have to do on their end, and what you need to do on your end.
ISP end
assuming the class C is 216.237.21.0/24 and the subnet you own is 216.237.21.64/26):
21.237.216.in-addr.arpa [SOA Entries]
21.237.216.in-addr.arpa [NS Servers]
;someone else’s entry
$GENERATE 1-63 $ IN PTR 216-237-21-$.orng.nextweb.net.
;start of your entry
64-127 IN NS ns1.mydomain.net.
64-127 IN NS ns2.mydomain.net.
$GENERATE 64-127 $ CNAME $.64-127
;someone else’s entry
$GENERATE 128-255 $ IN PTR 216-237-21-$.orng.nextweb.net.
Client Side
Create the following zone “64-255.21.237.216.in-addr.arpa” with the following entry:
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