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2021-10-10 18:09:29 List of Decompilers

• JVM-based languages
• Krakatau - the best decompiler I have used. Is able to decompile apps written in Scala and Kotlin into Java code. JD-GUI and Luyten have failed to do it fully.

• JD-GUI
• procyon
◦ Luyten - one of the best, though a bit slow, hangs on some binaries and not very well maintained.
• JAD - JAD Java Decompiler (closed-source, unmaintained)
• JADX - a decompiler for Android apps. Not related to JAD.
• .net-based languages
◦ dotPeek - a free-of-charge .NET decompiler from JetBrains
◦ ILSpy - an open-source .NET assembly browser and decompiler
◦ dnSpy - .NET assembly editor, decompiler, and debugger

Native code
◦ Hopper - A OS X and Linux Disassembler/Decompiler for 32/64-bit Windows/Mac/Linux/iOS executables.
◦ cutter - a decompiler based on radare2.
◦ retdec
◦ snowman
◦ Hex-Rays

Python
◦ uncompyle6 - decompiler for the over 20 releases and 20 years of CPython.


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2021-10-09 09:52:50 What is Cryptography?

Cryptography is the study of secure communications techniques that allow only the sender and intended recipient of a message to view its contents.When transmitting electronic data, the most common use of cryptography is to encrypt and decrypt email and other plain-text messages.Modern cryptography uses sophisticated mathematical equations (algorithms) and secret keys to encrypt and decrypt data. Today, cryptography is used to provide secrecy and integrity to our data, and both authentication and anonymity to our communications.An example of basic cryptography is an encrypted message in which letters are replaced with other characters. To decode the encrypted contents, you would need a grid or table that defines how the letters are transposed.


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2021-10-09 07:44:26 Whoever is Online Are Lucky Open / Comment

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2021-10-08 14:21:22 How to solve CTF

Challenge types

Jeopardy style CTFs challenges are typically divided into categories. I'll try to briefly cover the common ones.

Cryptography - Typically involves decrypting or encrypting a piece of data

Steganography - Tasked with finding information hidden in files or images

Binary - Reverse engineering or exploiting a binary file

Web - Exploiting web pages to find the flag

Pwn - Exploiting a server to find the flag

Where do I start?

If I managed to pique your curiosity, I've compiled a list of resources that helped me get started learning. CTF veterans, feel free to add your own resources in the comments below!

Learning

http://ctfs.github.io/resources/ - Introduction to common CTF techniques such as cryptography, steganography, web exploits (Incomplete)

https://trailofbits.github.io/ctf/forensics/ - Tips and tricks relating to typical CTF challenges/scenarios

https://ctftime.org/writeups - Explanations of solutions to past CTF challenges

Resources

https://ctftime.org - CTF event tracker

https://github.com/apsdehal/awesome-ctf - Comprehensive list of tools and further reading

Tools (That I use often)

binwalk - Analyze and extract files

burp suite - Feature packed web penetration testing framework

stegsolve - Pass various filters over images to look for hidden text

GDB - Binary debugger

The command line :)

Practice

Many of the "official" CTFs hosted by universities and companies are time-limited competitions. There are many CTFs however that are online 24/7 that can be used as practice and learning tools. Here are some that I found to be friendly for beginners.

https://ctflearn.com - A collection of various user-submitted challenges aimed towards newcomers

https://overthewire.org/wargames/ - A series of progressively more difficult pwn-style challenges. (Start with the bandit series)

https://2018game.picoctf.com/ - Yearly time-limited CTF now available to use as practice

Conclusion

CTF is a great hobby for those interested in problem-solving and/or cyber security. The community is always welcoming and it can be a lot of fun tackling challenges with friends.
Thank you for reading!


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2021-10-08 10:31:57 What is CTF?

CTF (Capture The Flag) is a kind of information security competition that challenges contestants to solve a variety of tasks ranging from a scavenger hunt on wikipedia to basic programming exercises, to hacking your way into a server to steal data. In these challenges, the contestant is usually asked to find a specific piece of text that may be hidden on the server or behind a webpage. This goal is called the flag, hence the name! Like many competitions, the skill level for CTFs varies between the events. Some are targeted towards professionals with experience operating on cyber security teams. These typically offer a large cash reward and can be held at a specific physical location.


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