So, binary is actually a lot of fun and much easier to do than it may seem. In this quick tutorial I plan to show you: what Binary numerics or Base 2 and Base 10 or decimal numerics are, how to change binary into decimal/ decimal into binary, and a quick example of what an IPv4 address/ subnet would look like in binary.

What is Binary?When you are talking about numbers, Binary is a way of counting at a base of two (0 being off,1 and being on) instead of base 10 (0,1,2,3,4,5,6,7,8,9). It’s still used in modern computers, and more than likely will continue to be seen in computers to come. Originally when computers were designed it was a more practical option, and if it works, why change it? Well here’s the thing we can’t change it. Circuits can only be in two states: ON and OFF. For a computer to interact with the circuitry and make your computer do what it does, it needs to tell it what to do, where to power things and where to turn them off. There is no state in between on and off (this doesn’t apply to quantum computing). So all that data that gets sent has to go through as binary and work it’s way out to be deciphered into a readable and recognizable output. We have to use binary, and that’s the only practical option we have.

What is Decimal?It’s the numbers you are use to seeing: 23928108.

What the base means, I am no expert in math so explaining this would be much easier through example.

–In 10 Base you have a number selection of 0-9 (10 digits) You take the base of 10 and apply exponents: 10(which is the base)^x

10^0 10^1 10^2 10^3 10^4 10^5 10^6 10^7 10^8 10^9 etc…

1 10 100 1000 10000 100000 1000000 10000000 100000000 1000000000

So as a foundation to understanding decimal we’ll take a number: 1,253 this number is one-thousand two-hundred fifty three

1000 x 1= 1000

100 x 2= 200

10 x 5= 50

+ 1 x 3= 3

1,253

Changing Decimal to Binary:

We’ll take that same number 1253 in binary that would be 1001110101

I’m sure at this point your thinking to yourself,”that does not explain how to change decimal into binary, what kind of scam is this?!”

First, you are right. It isn’t. I’m getting to that. Second, this is free, it is not a scam. Don’t start sending me money so you can call it one.

Back on topic: the same way we did base 10 we are going to take a look at base 2.

We have a number selection of 0-1 (2 digits) to get the decimals we are going to do the same thing we did with base ten, getting the exponents and placing a column value!

So bases of 2:

2^11 – 2^10 – 2^9 – 2^8 – 2^7 – 2^6 – 2^5 – 2^4 – 2^3 – 2^2 – 2^1 – 2^0

2048 1024 512 256 128 64 32 16 8 4 2 1

I stopped at 2048 for this; there is no need to go over the decimal amount that we are trying to convert.

first thing we need to do is take 1024 and subtract it from 1253, because that is the number we are converting.

We already know that 1024 goes into 1253 so we are going to place a 1 in that spot.

1253-1024=229 so a 1 goes where 2^10 is||you can’t subtract (while getting a negative number 512 or 256 from 229 so place a 0 in those spots)

you can subtract 128 from 229 so you would place a 1 in the spot that 128 goes.

SIMPLE TIP: If you can subtract a number from the remainder of the previous number place a 1 if you can’t place a 0 in each spot following until you can subtract the number then place a 1. So if you have to subtract, place a one, if you can’t place a 0. See the example below.

EXAMPLE:

1 0 0 1 1 1 0 0 1 0 1 therefore 1253= 1001110101

1253 229 101 37 5 3 1

-1024 512 256 -128 -64 -32 16 8 -4 -1

= 229 =101 =47 =5 =1 =0

Changing Binary into Decimal: THE EASY PART.

We are going to use the same number as above for this: 10011100101

This truly is easier than converting decimal to binary all you need to know is how to multiply by one and zero and add.

You lay out the columns and place the ones and zeros respectively. Each column gets a digit.

Any column that has a one you multiply that column by 1.

Any column that has a zero you multiply it by zero.

Once you’ve multiplied everything get all of the numbers remaining and add them together to get your decimal number.

1024 512 256 128 64 32 16 8 4 2 1

1 0 0 1 1 1 0 0 1 0 1

=1024 =128 =64 =32 =4 =1

1024+128+64+32+4+1=1253

What an IP address and it’s subnet mask would look like would look like in Binary.

Example:

IP address: 192.168.0.1

Subnet Mask: 255.255.255.0

So as I’m sure you are familiar with this I am going to explain: an IP addres is 4 octets (8-bit) numbers that give your a network address there are a total of 32 bytes in the IPv4 addresses and subnets.

A bit in the most basic way is just a digit.

So when you turn these numbers into binary you only do one octet at a time:

IP address: 192(octet).168(octet).0(octet).1(octet)

Decimal: 192.168.0.1 Binary: 11000000.10101000.00000000.00000001

Decimal 255.255.255.0 Binary: 11111111.11111111.11111111.00000000

Changing 192.168.0.1 into binary:

Just like we did earlier set out the columns, it’s easier this time because we only have 8 bits(1s/0s) to worry about, on all of these.

1 1 0 0 0 0 0 0

192 64

-128 64 32 16 8 4 2 1

=64 =0

192= 11000000

1 0 1 0 1 0 0 0

168 40 8

128 64 32 16 8 4 2 1

40 8 0

168=10101000

So far we have 11000000.10101000

0 that’s easy it’s 0. But we need 8 bits for the address to work, so for any number in the 8 columns that doesn’t have a one we give a 0.

So far: 11000000.10101000.00000000

Here is where I can give you an example of what happens when you do not have enough to make 8 bits and what you do. (Hint you make it have 8 bits)

0 0 0 0 0 0 0 1

1

128 64 32 16 8 4 2 1

0

and the given ip adress is 11000000.10101000.00000000.00000001

This might come naturally to you it might not, it’s easier than it looks, and I hope I was able to teach you binary well. If you have any questions, please feel free to contact me or leave a comment.

On a related note, here is a video my wife showed me with the same concept of alternate base numbers, except base 12 instead of base 2… and it’s less convoluted because it’s Schoolhouse Rock!

Filed under: IPv4, Math, Tutorials Tagged: base 10, base 2, Binary number, Binary numeral system, Column, Decimal, ip, Multiplication, Subtraction ]]>

USE GOOGLE BEFORE YOU TRY TO DO SOMETHING!

So, I looked at a few quick tutorials on how to partition my hard drives through windows and I set off on my adventure. At this point I partitioned 60 GB for Ubuntu and a put in my Live CD for installation. Everything went smooth (minus some BiOS configuration I didn’t know was needed) and I got Ubuntu up and running! Sweet, loving it. After a few weeks of messing around with Ubuntu, I realized it wasn’t enough and I stumbled upon Kali Linux, the predecessor to Backtrack 5 and quickly came to the conclusion that I must and will have it.

I burned a Live CD and used GParted to create a partition this time. GParted is the parition editor for most of the Linux distrobutions, and also it works differently from the Windows Partition editors. I thought I knew what I was doing and proceeded to seemingly destroy my computer.

Where I failed and the consequences:

I created a partition and moved it before my boot.

—This made it so that the GRUB boot loader would start but a kernel emergency would show up when I tried to boot Linux. When I tried to boot Windows I got the blue screen of death.

-I had no idea what had happened and because I was new to this I felt like this was the end of my computer. I found out about booting GParted off of a Live CD, if you have no access to your operating systems, this is the only way to go.

—-This is the link to the ISO for GParted—

http://gparted.sourceforge.net/download.php

-Rather than looking at my partitions and trying to figure out what went wrong, easy enough as it was and easy enough to fix (move the partition for the Kali Linux after the boot partition) I took the reasonable approach and completely formated my hard drive.

-It was at this point that I tried to install my backup of Windows 8, only to realize that it was a bad DVD. A simple fix to this is: Always remember to make multiple copies of OS’s and to at the very least check to make sure they work before you put them away. This is especially the case if they aren’t open source.

You don’t want to have to many partitions either, if you like to change from OS to OS then your best and safest option would be to try booting off of a virtual drive.

I gotta say though, I have been having a lot of fun after forcing myself to only use Linux. Please though for your own sanity, before you do anything that could potentially destroy your computer or make you lose something that could hold important information or something of sentimental value, google your issues. If you don’t have a computer to do that with, use a phone, go to the library, use a friends computer, anything. I gauruntee, that whatever issue that you are having, a hundred people have faced it as well and ten times that amount have fixed it. So if you aren’t a professional by trade, seek out the free help, it will save you hours of time and you won’t have to have as many headaches.

Christian

Wifes frustation: 10/10Fun had:10/10

Filed under: Blog, Fixes, Uh-oh Tagged: BIOS, GParted, Linux, List of disk partitioning software, Live CD, Microsoft Windows, Operating system, System partition and boot partition, Ubuntu ]]>

**What is this “Hiding Keys” you speak of?**

Thank you for asking, citizen! This blog will document my exploits as I delve into the world of computer security. I will show you how thoroughly destroying your computer through lack of know-how, making basic mistakes, and eventually fixing it all can be extremely fun and educational. Exploration is the key to discovery, eh? Hopefully, you’ll learn to find joy in your mistakes with me, as I document my “uh-ohs,” review operating systems and software, and give tutorials on the things I come to figure out.

**I thought this was in relation to computer security?**

It is, but everyone has to start somewhere. Why not start from the ground up?

I have a few posts to push through as I have had a good amount that has happened since I intended to start this page, so I’ll begin with the past couple of months and get to my current adventures.

Each post will include a rating of my wife, Evan’s, frustration, along with a second rating of how completely awesome I thought the experience was.

*Example : *

Evan’s frustration with the past month and me crashing my computer several times: **9/10**

[She would like to make it clear that losing Windows was not a good thing, I, however, would like to make it clear that I disagree.]

Amount of fun I’ve had with fighting my computer: **11/10**

Hope you enjoy!

- What I am doing with this blog. (hidingkeys.wordpress.com)

Filed under: Blog Tagged: Computer security, Operating system, Security ]]>