Digital Signature

Below is a definition what is a digital signature:

"Hash value of a message when encrytpted with the private key of a person is his/her digital signature on that document."

As you can deduce from the definition above that the digital signature of a person is different for (almost) every document unlike original signatures. Well maybe you can argue that even two original signatures also cannot be the same. I'll accept it. =)

Casino Security

Well... Security levels of casinos are not bad. (From Person of Interest - S02E18)

Sound Extracted From a Silent Video

Can sound be extracted from a silent video? Well watch this then:

http://www.ted.com/talks/michael_rubinstein_see_invisible_motion_hear_silent_sounds_cool_creepy_we_can_t_decide?utm_source=email&source=email&utm_medium=social&utm_campaign=ios-share#t-779993

How to Learn the IP Address of Your Active Directory Server

Recently I needed to learn the IP address of our active directory server(s). I wanna share how I learnt it/them.

First open your command shell. (cmd.exe) Then type the following: (I masked our IP addresses below of course where you will see some X's, Y's or Z's or some combination of letters.)

C:\Windows\system32> nslookup

Default Server: xyzt.abc.local

Address:  10.xxx.yyy.zzz

> {This prompt is where you will/can do some DNS queries}

> set type=all

> _ldap._tcp.dc._msdcs.abc.local {abc.local is the name of our domain}

The output will be the following:

Server:  xyzt.abc.local

Address:  10.xxx.yyy.zzz

_ldap._tcp.dc._msdcs.abc.local      SRV service location:

          priority       = 0

          weight         = 100

          port           = 389

          svr hostname   = server1.abc.local

_ldap._tcp.dc._msdcs.abc.local      SRV service location:

          priority       = 0

          weight         = 100

          port           = 389

          svr hostname   = server2.abc.local

_ldap._tcp.dc._msdcs.abc.local      SRV service location:

          priority       = 0

          weight         = 100

          port           = 389

          svr hostname   = server3.abc.local

_ldap._tcp.dc._msdcs.abc.local      SRV service location:

          priority       = 0

          weight         = 100

          port           = 389

          svr hostname   = server4.abc.local

{Below are the names and IP addresses of our active directory servers}

server1.abc.local   internet address = 10.xxx.yyy.zzx

server2.abc.local   internet address = 10.xxx.yyy.zzy

server3.abc.local   internet address = 10.xxx.yyy.zzz

server4.abc.local   internet address = 10.xxx.yyy.zzt

Four server are listed after executing the command because it seems that we have four active directory servers in our company. This also a new information for me =) )

Personal Data

According to Gartner, by 2019, 90% of organizations will have personal data on IT systems they don't own or control.

It seems that it is going to be a big problem against the privacy of most of the people on the planet.

(For more: http://www.gartner.com/newsroom/id/2513615)