i solved this!

can i solve this on MacOS?

can i solve this on MacOS?

H1 My write up for this room

Check-it-out: Link

that's fun , my first challenge

This is not easy for a beginner . tool me whole day to crack it

This was fun!

super ez with decompiler

Well, that was fun !

I don't have any idea, how to perform reverse engineering, as this is the first CTF that I'm playing of Reverse Enginnering. so what thing should I learn first to perform Reverse Enginnering? #help

I don't know where to start. how should I go about reverse engineering it? P.S : I'm not asking for flag or solution.

Hello camus_,

Java (the language android apps are built in) has the near unique property of being reversible to almost the exact code it was built from. As such a good place to begin on challenges like this one are to decompile the app into a human readable form. I prefer Jadx-gui on a Kali linux install but there are also some online decompilers like this one http://www.javadecompilers.com/apk

did^

AWESOME! Glad you enjoyed it.

hey does apktool work?

yes

Thanks

Try to use online decompiler or linux command line apktool d filetodecompile.apk

Ive been told by a number of users that they have had issues with the md5 portion of this challenge. As cracking it was not the focus point I have provided a link below to a website that will successfully decrypt it.

https://www.md5online.org/md5-decrypt.html

My very first RE. I loved that the flag was not given as a single piece. Nicely done. Thank you

I don't have any idea, how to perform reverse engineering, as this is the first CTF that I'm playing of Reverse Enginnering. so what thing should I learn first to perform Reverse Enginnering? #help

Excellent! I learned to use 2 new online tools, one to decompile the api file and the other to decode the MD5 hash.

Thanks your hint

My first RE with apk file! I don't think this could've been done much better for an intro

which folder is the Java source code ? i have de-compiled and unzipped the apk then l was greeted with a lot of folder