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writeup
01 Jun

Brain fuzzing

Category: 

This kind of famous task. You have board with buttons, wich have 2 positions. In Russia there is old quest game with brother pilots and there was the same task to open the fridge with board 4x4. And there was solution remember all buttons in first position. And switch all this buttons one by one. Repeating this algoritm from 1 to 3 times, you will win.

writeup
17 Mar

Secret String (ppc 300)

Category: 

As we can see from the task, the talk is about DNA replication, as said my friends from team, we should find the most popular string in the given file.

First of all, I should say, that I'm using python. In the start I just tried to build index where keys are string that can be found in file and values are there frequency. But that didn't work. Because in python index always saved in the RAM, and for my counting, I should have more than 16GB (I think something like 32 or 64). That numbers is reachable, but I guessed that it should be better solution.

writeup
04 Mar

NEOQUEST 2014 Quals - TimeShift 2. Revenge

Category: 

Задание:

        Мое внимание привлекает монитор. На него наклеен стикер с надписью B4365F2. Видимо, это какой-то ключ. На экране мигают две точки, соединенные пунктиром, а ниже бегут пакеты сетевого трафика. Наверное, это передача каких-то команд ракете. Но, по всей видимости, передаваемые данные зашифрованы... На компьютере также открыт файл, в котором записаны два IP-адреса (213.170.102.196:4001, 213.170.102.197:4002). Наверняка IP-адреса помогут мне понять схему работы протокола, по которому передаются команды! Да и в отладочной информации, если покопаться, можно будет обнаружить что-нибудь полезное...

writeup
04 Feb

Challenge 1: Guerilla

Category: 

First we see the text on the page: "You must specify a nick". After quick look into source code of the page we understand that our URL must contain GET-parameter 'nick' with random value.

Then server sends us some leet-modified string like 

51xty tw0 plu5 0n3

and expecting from us solution of this expression in the same format.

Experimentally found that there is only 4 leet-modified characters: '1' == 'i', '3' == 'e', '5' == 's', '0' == 'o'.

writeup
02 Feb

Markoff

Category: 

The name of this task connected to "Markov chain"

The main idea of that system is that the next state depends only on the current state, and there is a probability of transition.

First try shows, that one word phrases are shutting down the connection.

So we need to start with two word phrase. First hint is in the password:"talk_with_markov_about_positive_things".

writeup
30 Jan

Rbox

Category: 
 
Задание:
 
Unhash this:
5ebad7dcbd73584f32ef949486a161a1e9f10e48ade43b03649a2ca680f327c4
 
nc 195.133.87.165 5555
Auth token: rb0xch4ll3ng3
 
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