Reverse Engineering

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///Reverse Engineering Tools//////
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nm
====

* local and library function and local function & global variables

* Usage:
        nm binary_file(ELF file)

strings
=======

* Print the strings of printable characters in files

* Usage:
        strings binary_file(ELF file)

Ltrace
======

* Traces the calls to the library function
* It executes the program in that process

* Usage:
        ltrace binary_file(ELF file)

Strace
======

* Trace the system calls made by the program
    i.e any library fn , system calls

* Usage:
        strace binary_file(ELF file)

src:http://www.thegeekstuff.com/2012/03/reverse-engineering-tools/

Comments

BlockChain

As the name says chain of block Now what is a block? A block typically contains a cryptographic hash of the previous block, a timestamp transaction data Where it is used? It is the backbone of cryptocurrency i.e it ensure the security and integrity of data. The usage doesn't stop here well blockchain are resistant to modification of the data. so it can used in Bank Identity verification Hospital records and much more How it ensures security and integrity of data? Block added to the chain, contain the hash ( result obtained from hash algorithm such as MD5,SHA) of the previous block so changes in one block lead to mismatch. Proof of work algorithm - Adding a node in the block chain require validation whether the new block is valid or not which is done my miner if they find the valid hash they will be rewarded How to do one? The most interesting part ...

Ecosia

ECOSIA - A Green search engine “ Ecosia donates 80% profits to planting trees” Site: www.ecosia.org Lauched on 7 th December 2009 and created by Christian Kroll available in more than 26 language. It is located in Berlin, Germany.It is also called as CO2-neutral company.Ecosia has donated to different tree-planting programs. Until December 2010 Ecosia’s donations went to a program by WWF Germany that protected the Juruena-National park in the Amazonas. In order to make sure the protection was kept up, the program also drew up and financed plans with timber companies and the local communities. According to B-labs, as of January 2015, "In donating 80 percent of its ad revenue, the search engine has raised over $1.5 million for rainforest protection since its founding in December 2009." According to Ecosia, by 2015, the search engine had almost 2.5 million active users, and searches through it had resulted in more than 2 million trees being planted.Since October 201...

codefest-ctf-18 writeup

Codefest is online CTF challenge conducted by Hackerrank on August 31 2018 6:00 PM IST to September 1 2018 12:00 PM IST. They have given dozens of challenges. link: https://www.hackerrank.com/contests/codefest-ctf-18/challenges I manage to complete two challenges in this article i will explain how i solved the two Typing Master Question If you think you have it in you, connect now to 34.216.132.109 9093 and prove your mettle. You will be presented with a simple typing task which is meant to check your typing speed. For example, Can you type 'Z' 10 times followed by 'u' 6 times, followed by the sum of their ASCII values? ZZZZZZZZZZuuuuuu207 Input Format Regarding input to the server - The question was designed keeping netcat in mind. Some users who are using other tools/language (eg, Python, PuTTY, TELNET) to connect to the server please note that they do not terminate the strings like netcat does. If you choose not to use netcat, t...

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