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07 - Santa Rider

Description

Level: Easy
Author: inik

Santa is prototyping a new gadget for his sledge. Unfortunately it still has some glitches, but look for yourself.

HV19-SantaRider.zip

Solution

For this challenge we get an mp4 file which shows eight blinking LEDs. After a few iterations of a simple blinking pattern the LEDs start blinking in a new pattern. I went through the video frame by frame and wrote down the state of each LED (1 means on and 0 represents off). Converting the binary sequence to a string gives the flag HV19{1m_als0_w0rk1ng_0n_a_r3m0t3_c0ntr0l}.