5 March 2019

Bsides Ctf Blink

by eshaan7

Challenge: Blink(for 50 points)


Get past the Jedi mind trick to find the flag you are looking for.
File: blink.apk

On installing the app on a mobile, we see this:

Then I used apktool to decompile it.

apktool d blink.apk

Going into the smali folder created by apktool


There’s a r2d2.smali file. Inside there’s a string of base64 encoded image.

I saved the string to blink_r2d2.txt

cat blink_r2d2.txt | base64 -d > flag.png

On decoding the base64 string, and we get an image and the flag.

Thankyou for reading, happy hackin’! ~ eshaan7