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HACKvent 2015: Day 13

13 Dec 2015

Challenge

The following image was also provided: Solution First I suspect the common least significant bit steganography technique has been used here where the least two or one significant bit(s) of the image have been changes so other images can be hidden without affecting the appearance of the first image by much. I load up…read more.

 
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HACKvent 2015: Day 12

12 Dec 2015

Challenge

The following C code is also provided:

  Solution Clearly the issue here is that this program is very inefficient. So what does the program do? First it sets the unsigned 64 bit integer variables  val and i  to 0. Then 0xC0DE42 iterations occur and the val is recomputed each calculation. The previous val  and i …read more.

 
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HACKvent 2015: Day 11

11 Dec 2015

Challenge The following image is provided: Solution I had to spend some time researching the above image but I soon discover that it is a punch card. It turns out to be a IBM 96 Column Punchcard. Unfortunately there isn’t much information online on how to decode them. A reverse image search comes up with the following image:…read more.

 
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5138 – Escape from Python City

10 Dec 2015

I connect to the server and am presented with the following message:

I type in ls and am presented with the following:

I am in a python sandbox and must escape or read the key.txt file somehow. I try to simply type in sh and get the following message:

I notice the exception and figure…read more.

 
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HACKvent 2015: Day 10

10 Dec 2015

Challenge

The following zip file was also provided: Download ZIP File Solution We notice that the zip file nasty-Shit.zip contains one zip file called 1.zip, that contains one zip file called 2.zip and so on. I also know that the file zile will keep getting lower and lower in file size the more we…read more.

 
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Creating an Extremely Strong and Unique Password

10 Dec 2015

In this post I’ll give you a method to create a really strong and flexible password. Now i’ve personally only gone through 5-6 passwords in the last 8 years. The first 2 passwords were insanely weak (6 digit numbers!). I then started picking stronger passwords but unfortunately I’ve had to change my password multiple times due…read more.

 
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Advent Of Code: Day 8

09 Dec 2015

Challenge

Solution A fairly simple puzzle. My approach was to add up the strings together and use regular expressions to replace special characters with a * character so that the python len function would provide me with the correct result. Script:

 

 
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HACKvent 2015: Day 1

09 Dec 2015

Challenge

Solution I decode the string above using a Vigenere Cipher solver with the key ‘geek‘ (deduced from frequency analysis). The message I get is:

The message is pretty clear. First spot I check as a webmaster is /robots.txt (psss go check my websites robots.txt :p). I find 1 disallowed resource which is: /MeMyselfAndI-surfingInTheSky/hacker.jpg I visit this…read more.

 
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HACKvent 2015: Day 9

09 Dec 2015

Challenge

The following sound file was also provided: Download MP3 Solution This was a very simple challenge. First we listen to the transmission and discover it spells out the nugget but some characters are turned into noise. We get:

The ?  character represents a character in the set [A-Za-z0-9] (because those are the only…read more.

 
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HACKvent 2015: Day 8

08 Dec 2015

Challenge

Link to website (may be down): http://hackvent.hacking-lab.com/xMasStore_wqbrGjHxxZ9YkbfiKiGC/index.php Solution I inspect the source of the website and take a look at the background image but that seems to be fine. There is nothing else of interest on the website so I figure this may require a brute-force attack. I then however find a cookie that is…read more.

 
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