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A simple APK, reverse engineer the logic, recreate the flag, and submit!
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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
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silkim
man this was fun
EasyDonkey
[REDACTED] This comment is only shown to users who have solved this challenge.
jluna
[REDACTED] This comment is only shown to users who have solved this challenge.
AntonioCaesar
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Bensnappy
Really fun challenge and a good intro to android reverse engineering, although I wish I'd read through more of the comments sooner. I ended up trying to brute force the hash stuff for a little while before I realized there were probably websites for that.
rokka
Nice. Great fun! Thank you!
bt7274
This is a good one. You can use apktool on linux, but use it only if you are a little familiar with assembly. Otherwise use one of the online tools mentioned in the comment.
c0conut
First time trying to deal with a RE task. A nice task for beginner!
elliot_pwn
This was nice . Learned something new!
V1L3N
My first RE challenge, took me a lot of time and help but still it was fun to solve!